0a13382c8e
erc32 PR 18273 * sis.c (main): Remove unreachable code. m68hc11 * gencode.c (gen_fetch_operands): Remove unreachable code. ppc * hw_htab.c (htab_map_binary): Fix overlap check. common * sim-fpu.c (INLINE_SIM_FPU): Fix static analysis warning by increasing parenthesis around casts to signed values.
692 lines
21 KiB
C
692 lines
21 KiB
C
/* This file is part of the program psim.
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Copyright 1994, 1995, 1996, 2003, 2004 Andrew Cagney
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _HW_HTAB_C_
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#define _HW_HTAB_C_
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#include "device_table.h"
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#include "device.h"
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#include "bfd.h"
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/* DEVICE
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htab - pseudo-device describing a PowerPC hash table
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DESCRIPTION
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During the initialization of the device tree, the pseudo-device
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<<htab>>, in conjunction with any child <<pte>> pseudo-devices,
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will create a PowerPC hash table in memory. The hash table values
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are written using dma transfers.
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The size and address of the hash table are determined by properties
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of the htab node.
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By convention, the htab device is made a child of the
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<</openprom/init>> node.
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By convention, the real address of the htab is used as the htab
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nodes unit address.
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PROPERTIES
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real-address = <address> (required)
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The physical address of the hash table. The PowerPC architecture
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places limitations on what is a valid hash table real-address.
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nr-bytes = <size> (required)
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The size of the hash table (in bytes) that is to be created at
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<<real-address>>. The PowerPC architecture places limitations on
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what is a valid hash table size.
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claim = <anything> (optional)
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If this property is present, the memory used to construct the hash
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table will be claimed from the memory device. The memory device
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being specified by the <</chosen/memory>> ihandle property.
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EXAMPLES
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Enable tracing.
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| $ psim -t htab-device \
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Create a htab specifying the base address and minimum size.
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| -o '/openprom/init/htab@0x10000/real-address 0x10000' \
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| -o '/openprom/init/htab@0x10000/claim 0' \
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| -o '/openprom/init/htab@0x10000/nr-bytes 65536' \
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BUGS
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See the <<pte>> device.
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*/
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/* DEVICE
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pte - pseudo-device describing a htab entry
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DESCRIPTION
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The <<pte>> pseudo-device, which must be a child of a <<htabl>>
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node, describes a virtual to physical mapping that is to be entered
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into the parents hash table.
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Two alternative specifications of the mapping are allowed. Either
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a section of physical memory can be mapped to a virtual address, or
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the header of an executible image can be used to define the
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mapping.
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By convention, the real address of the map is specified as the pte
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devices unit address.
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PROPERTIES
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real-address = <address> (required)
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The starting physical address that is to be mapped by the hash
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table.
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wimg = <int> (required)
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pp = <int> (required)
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The value of hash table protection bits that are to be used when
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creating the virtual to physical address map.
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claim = <anything> (optional)
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If this property is present, the real memory that is being mapped by the
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hash table will be claimed from the memory node (specified by the
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ihandle <</chosen/memory>>).
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virtual-address = <integer> [ <integer> ] (option A)
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nr-bytes = <size> (option A)
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Option A - Virtual virtual address (and size) at which the physical
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address is to be mapped. If multiple values are specified for the
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virtual address then they are concatenated to gether to form a
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longer virtual address.
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file-name = <string> (option B)
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Option B - An executable image that is to be loaded (starting at
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the physical address specified above) and then mapped in using
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informatioin taken from the executables header. information found
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in the files header.
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EXAMPLES
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Enable tracing (note that both the <<htab>> and <<pte>> device use the
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same trace option).
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| -t htab-device \
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Map a block of physical memory into a specified virtual address:
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| -o '/openprom/init/htab/pte@0x0/real-address 0' \
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| -o '/openprom/init/htab/pte@0x0/nr-bytes 4096' \
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| -o '/openprom/init/htab/pte@0x0/virtual-address 0x1000000' \
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| -o '/openprom/init/htab/pte@0x0/claim 0' \
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| -o '/openprom/init/htab/pte@0x0/wimg 0x7' \
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| -o '/openprom/init/htab/pte@0x0/pp 0x2' \
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Map a file into memory.
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| -o '/openprom/init/htab/pte@0x10000/real-address 0x10000' \
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| -o '/openprom/init/htab/pte@0x10000/file-name "netbsd.elf' \
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| -o '/openprom/init/htab/pte@0x10000/wimg 0x7' \
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| -o '/openprom/init/htab/pte@0x10000/pp 0x2' \
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BUGS
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For an ELF executable, the header defines both the virtual and real
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address at which each file section should be loaded. At present, the
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real addresses that are specified in the header are ignored, the file
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instead being loaded in to physical memory in a linear fashion.
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When claiming memory, this device assumes that the #address-cells
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and #size-cells is one. For future implementations, this may not
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be the case.
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*/
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static void
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htab_decode_hash_table(device *me,
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unsigned32 *htaborg,
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unsigned32 *htabmask)
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{
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unsigned_word htab_ra;
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unsigned htab_nr_bytes;
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unsigned n;
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device *parent = device_parent(me);
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/* determine the location/size of the hash table */
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if (parent == NULL
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|| strcmp(device_name(parent), "htab") != 0)
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device_error(parent, "must be a htab device");
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htab_ra = device_find_integer_property(parent, "real-address");
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htab_nr_bytes = device_find_integer_property(parent, "nr-bytes");
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if (htab_nr_bytes < 0x10000) {
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device_error(parent, "htab size 0x%x less than 0x1000",
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htab_nr_bytes);
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}
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for (n = htab_nr_bytes; n > 1; n = n / 2) {
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if (n % 2 != 0)
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device_error(parent, "htab size 0x%x not a power of two",
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htab_nr_bytes);
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}
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*htaborg = htab_ra;
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/* Position the HTABMASK ready for use against a hashed address and
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not ready for insertion into SDR1.HTABMASK. */
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*htabmask = MASKED32(htab_nr_bytes - 1, 7, 31-6);
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/* Check that the MASK and ADDRESS do not overlap. */
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if ((htab_ra & (*htabmask)) != 0) {
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device_error(parent, "htaborg 0x%lx not aligned to htabmask 0x%lx",
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(unsigned long)*htaborg, (unsigned long)*htabmask);
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}
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DTRACE(htab, ("htab - htaborg=0x%lx htabmask=0x%lx\n",
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(unsigned long)*htaborg, (unsigned long)*htabmask));
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}
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static void
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htab_map_page(device *me,
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unsigned_word ra,
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unsigned64 va,
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unsigned wimg,
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unsigned pp,
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unsigned32 htaborg,
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unsigned32 htabmask)
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{
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/* keep everything left shifted so that the numbering is easier */
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unsigned64 vpn = va << 12;
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unsigned32 vsid = INSERTED32(EXTRACTED64(vpn, 0, 23), 0, 23);
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unsigned32 vpage = INSERTED32(EXTRACTED64(vpn, 24, 39), 0, 15);
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unsigned32 hash = INSERTED32(EXTRACTED32(vsid, 5, 23)
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^ EXTRACTED32(vpage, 0, 15),
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7, 31-6);
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int h;
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for (h = 0; h < 2; h++) {
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unsigned32 pteg = (htaborg | (hash & htabmask));
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int pti;
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for (pti = 0; pti < 8; pti++) {
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unsigned32 pte = pteg + 8 * pti;
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unsigned32 current_target_pte0;
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unsigned32 current_pte0;
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if (device_dma_read_buffer(device_parent(me),
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¤t_target_pte0,
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0, /*space*/
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pte,
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sizeof(current_target_pte0)) != 4)
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device_error(me, "failed to read a pte at 0x%lx", (unsigned long)pte);
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current_pte0 = T2H_4(current_target_pte0);
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if (MASKED32(current_pte0, 0, 0)) {
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/* full pte, check it isn't already mapping the same virtual
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address */
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unsigned32 curr_vsid = INSERTED32(EXTRACTED32(current_pte0, 1, 24), 0, 23);
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unsigned32 curr_api = INSERTED32(EXTRACTED32(current_pte0, 26, 31), 0, 5);
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unsigned32 curr_h = EXTRACTED32(current_pte0, 25, 25);
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if (curr_h == h
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&& curr_vsid == vsid
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&& curr_api == MASKED32(vpage, 0, 5))
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device_error(me, "duplicate map - va=0x%08lx ra=0x%lx vsid=0x%lx h=%d vpage=0x%lx hash=0x%lx pteg=0x%lx+%2d pte0=0x%lx",
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(unsigned long)va,
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(unsigned long)ra,
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(unsigned long)vsid,
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h,
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(unsigned long)vpage,
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(unsigned long)hash,
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(unsigned long)pteg,
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pti * 8,
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(unsigned long)current_pte0);
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}
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else {
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/* empty pte fill it */
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unsigned32 pte0 = (MASK32(0, 0)
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| INSERTED32(EXTRACTED32(vsid, 0, 23), 1, 24)
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| INSERTED32(h, 25, 25)
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| INSERTED32(EXTRACTED32(vpage, 0, 5), 26, 31));
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unsigned32 target_pte0 = H2T_4(pte0);
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unsigned32 pte1 = (INSERTED32(EXTRACTED32(ra, 0, 19), 0, 19)
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| INSERTED32(wimg, 25, 28)
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| INSERTED32(pp, 30, 31));
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unsigned32 target_pte1 = H2T_4(pte1);
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if (device_dma_write_buffer(device_parent(me),
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&target_pte0,
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0, /*space*/
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pte,
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sizeof(target_pte0),
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1/*ro?*/) != 4
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|| device_dma_write_buffer(device_parent(me),
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&target_pte1,
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0, /*space*/
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pte + 4,
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sizeof(target_pte1),
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1/*ro?*/) != 4)
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device_error(me, "failed to write a pte a 0x%lx", (unsigned long)pte);
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DTRACE(htab, ("map - va=0x%08lx ra=0x%lx vsid=0x%lx h=%d vpage=0x%lx hash=0x%lx pteg=0x%lx+%2d pte0=0x%lx pte1=0x%lx\n",
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(unsigned long)va,
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(unsigned long)ra,
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(unsigned long)vsid,
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h,
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(unsigned long)vpage,
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(unsigned long)hash,
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(unsigned long)pteg,
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pti * 8,
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(unsigned long)pte0,
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(unsigned long)pte1));
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return;
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}
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}
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/* re-hash */
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hash = MASKED32(~hash, 0, 18);
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}
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}
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static unsigned_word
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claim_memory(device *me,
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device_instance *memory,
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unsigned_word ra,
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unsigned_word size)
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{
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unsigned32 args[3];
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unsigned32 results[1];
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int status;
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args[0] = 0; /* alignment */
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args[1] = size;
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args[2] = ra;
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status = device_instance_call_method(memory, "claim", 3, args, 1, results);
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if (status != 0)
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device_error(me, "failed to claim memory");
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return results[0];
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}
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static void
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htab_map_region(device *me,
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device_instance *memory,
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unsigned_word pte_ra,
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unsigned64 pte_va,
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unsigned nr_bytes,
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unsigned wimg,
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unsigned pp,
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unsigned32 htaborg,
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unsigned32 htabmask)
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{
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unsigned_word ra;
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unsigned64 va;
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/* claim the memory */
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if (memory != NULL)
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claim_memory(me, memory, pte_ra, nr_bytes);
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/* go through all pages and create a pte for each */
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for (ra = pte_ra, va = pte_va;
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ra < pte_ra + nr_bytes;
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ra += 0x1000, va += 0x1000) {
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htab_map_page(me, ra, va, wimg, pp, htaborg, htabmask);
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}
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}
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typedef struct _htab_binary_sizes {
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unsigned_word text_ra;
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unsigned_word text_base;
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unsigned_word text_bound;
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unsigned_word data_ra;
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unsigned_word data_base;
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unsigned data_bound;
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device *me;
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} htab_binary_sizes;
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static void
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htab_sum_binary(bfd *abfd,
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sec_ptr sec,
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PTR data)
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{
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htab_binary_sizes *sizes = (htab_binary_sizes*)data;
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unsigned_word size = bfd_get_section_size (sec);
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unsigned_word vma = bfd_get_section_vma (abfd, sec);
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unsigned_word ra = bfd_get_section_lma (abfd, sec);
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/* skip the section if no memory to allocate */
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if (! (bfd_get_section_flags(abfd, sec) & SEC_ALLOC))
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return;
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if ((bfd_get_section_flags (abfd, sec) & SEC_CODE)
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|| (bfd_get_section_flags (abfd, sec) & SEC_READONLY)) {
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if (sizes->text_bound < vma + size)
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sizes->text_bound = ALIGN_PAGE(vma + size);
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if (sizes->text_base > vma)
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sizes->text_base = FLOOR_PAGE(vma);
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if (sizes->text_ra > ra)
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sizes->text_ra = FLOOR_PAGE(ra);
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}
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else if ((bfd_get_section_flags (abfd, sec) & SEC_DATA)
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|| (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)) {
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if (sizes->data_bound < vma + size)
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sizes->data_bound = ALIGN_PAGE(vma + size);
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if (sizes->data_base > vma)
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sizes->data_base = FLOOR_PAGE(vma);
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if (sizes->data_ra > ra)
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sizes->data_ra = FLOOR_PAGE(ra);
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}
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}
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static void
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htab_dma_binary(bfd *abfd,
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sec_ptr sec,
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PTR data)
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{
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htab_binary_sizes *sizes = (htab_binary_sizes*)data;
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void *section_init;
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unsigned_word section_vma;
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unsigned_word section_size;
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unsigned_word section_ra;
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device *me = sizes->me;
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/* skip the section if no memory to allocate */
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if (! (bfd_get_section_flags(abfd, sec) & SEC_ALLOC))
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return;
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/* check/ignore any sections of size zero */
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section_size = bfd_get_section_size (sec);
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if (section_size == 0)
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return;
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/* if nothing to load, ignore this one */
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if (! (bfd_get_section_flags(abfd, sec) & SEC_LOAD))
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return;
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/* find where it is to go */
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section_vma = bfd_get_section_vma(abfd, sec);
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section_ra = 0;
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if ((bfd_get_section_flags (abfd, sec) & SEC_CODE)
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|| (bfd_get_section_flags (abfd, sec) & SEC_READONLY))
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section_ra = (section_vma - sizes->text_base + sizes->text_ra);
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else if ((bfd_get_section_flags (abfd, sec) & SEC_DATA))
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section_ra = (section_vma - sizes->data_base + sizes->data_ra);
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else
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return; /* just ignore it */
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DTRACE(htab,
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("load - name=%-7s vma=0x%.8lx size=%6ld ra=0x%.8lx flags=%3lx(%s%s%s%s%s )\n",
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bfd_get_section_name(abfd, sec),
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(long)section_vma,
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(long)section_size,
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(long)section_ra,
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(long)bfd_get_section_flags(abfd, sec),
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bfd_get_section_flags(abfd, sec) & SEC_LOAD ? " LOAD" : "",
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bfd_get_section_flags(abfd, sec) & SEC_CODE ? " CODE" : "",
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bfd_get_section_flags(abfd, sec) & SEC_DATA ? " DATA" : "",
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bfd_get_section_flags(abfd, sec) & SEC_ALLOC ? " ALLOC" : "",
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bfd_get_section_flags(abfd, sec) & SEC_READONLY ? " READONLY" : ""
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));
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/* dma in the sections data */
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section_init = zalloc(section_size);
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if (!bfd_get_section_contents(abfd,
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sec,
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section_init, 0,
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section_size)) {
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bfd_perror("devices/pte");
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device_error(me, "no data loaded");
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}
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if (device_dma_write_buffer(device_parent(me),
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section_init,
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0 /*space*/,
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section_ra,
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section_size,
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1 /*violate_read_only*/)
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!= section_size)
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device_error(me, "broken dma transfer");
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free(section_init); /* only free if load */
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}
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/* create a memory map from a binaries virtual addresses to a copy of
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the binary laid out linearly in memory */
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static void
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htab_map_binary(device *me,
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device_instance *memory,
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unsigned_word ra,
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unsigned wimg,
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unsigned pp,
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|
const char *file_name,
|
|
unsigned32 htaborg,
|
|
unsigned32 htabmask)
|
|
{
|
|
htab_binary_sizes sizes;
|
|
bfd *image;
|
|
sizes.text_ra = -1;
|
|
sizes.data_ra = -1;
|
|
sizes.text_base = -1;
|
|
sizes.data_base = -1;
|
|
sizes.text_bound = 0;
|
|
sizes.data_bound = 0;
|
|
sizes.me = me;
|
|
|
|
/* open the file */
|
|
image = bfd_openr(file_name, NULL);
|
|
if (image == NULL) {
|
|
bfd_perror("devices/pte");
|
|
device_error(me, "the file %s not loaded", file_name);
|
|
}
|
|
|
|
/* check it is valid */
|
|
if (!bfd_check_format(image, bfd_object)) {
|
|
bfd_close(image);
|
|
device_error(me, "the file %s has an invalid binary format", file_name);
|
|
}
|
|
|
|
/* determine the size of each of the files regions */
|
|
bfd_map_over_sections (image, htab_sum_binary, (PTR) &sizes);
|
|
|
|
/* if needed, determine the real addresses of the sections */
|
|
if (ra != -1) {
|
|
sizes.text_ra = ra;
|
|
sizes.data_ra = ALIGN_PAGE(sizes.text_ra +
|
|
(sizes.text_bound - sizes.text_base));
|
|
}
|
|
|
|
DTRACE(htab, ("text map - base=0x%lx bound=0x%lx-1 ra=0x%lx\n",
|
|
(unsigned long)sizes.text_base,
|
|
(unsigned long)sizes.text_bound,
|
|
(unsigned long)sizes.text_ra));
|
|
DTRACE(htab, ("data map - base=0x%lx bound=0x%lx-1 ra=0x%lx\n",
|
|
(unsigned long)sizes.data_base,
|
|
(unsigned long)sizes.data_bound,
|
|
(unsigned long)sizes.data_ra));
|
|
|
|
/* check for and fix a botched image (text and data segments
|
|
overlap) */
|
|
if ((sizes.text_base <= sizes.data_base
|
|
&& sizes.text_bound >= sizes.data_bound)
|
|
|| (sizes.data_base <= sizes.text_base
|
|
&& sizes.data_bound >= sizes.text_bound)
|
|
|| (sizes.text_bound > sizes.data_base
|
|
&& sizes.text_bound <= sizes.data_bound)
|
|
|| (sizes.text_base >= sizes.data_base
|
|
&& sizes.text_base < sizes.data_bound)) {
|
|
DTRACE(htab, ("text and data segment overlaped - using just data segment\n"));
|
|
/* check va->ra linear */
|
|
if ((sizes.text_base - sizes.text_ra)
|
|
!= (sizes.data_base - sizes.data_ra))
|
|
device_error(me, "overlapping but missaligned text and data segments");
|
|
/* enlarge the data segment */
|
|
if (sizes.text_base < sizes.data_base)
|
|
sizes.data_base = sizes.text_base;
|
|
if (sizes.text_bound > sizes.data_bound)
|
|
sizes.data_bound = sizes.text_bound;
|
|
if (sizes.text_ra < sizes.data_ra)
|
|
sizes.data_ra = sizes.text_ra;
|
|
/* zap the text segment */
|
|
sizes.text_base = 0;
|
|
sizes.text_bound = 0;
|
|
sizes.text_ra = 0;
|
|
DTRACE(htab, ("common map - base=0x%lx bound=0x%lx-1 ra=0x%lx\n",
|
|
(unsigned long)sizes.data_base,
|
|
(unsigned long)sizes.data_bound,
|
|
(unsigned long)sizes.data_ra));
|
|
}
|
|
|
|
/* set up virtual memory maps for each of the regions */
|
|
if (sizes.text_bound - sizes.text_base > 0) {
|
|
htab_map_region(me, memory, sizes.text_ra, sizes.text_base,
|
|
sizes.text_bound - sizes.text_base,
|
|
wimg, pp,
|
|
htaborg, htabmask);
|
|
}
|
|
|
|
htab_map_region(me, memory, sizes.data_ra, sizes.data_base,
|
|
sizes.data_bound - sizes.data_base,
|
|
wimg, pp,
|
|
htaborg, htabmask);
|
|
|
|
/* dma the sections into physical memory */
|
|
bfd_map_over_sections (image, htab_dma_binary, (PTR) &sizes);
|
|
}
|
|
|
|
static void
|
|
htab_init_data_callback(device *me)
|
|
{
|
|
device_instance *memory = NULL;
|
|
if (WITH_TARGET_WORD_BITSIZE != 32)
|
|
device_error(me, "only 32bit targets currently suported");
|
|
|
|
/* find memory device */
|
|
if (device_find_property(me, "claim") != NULL)
|
|
memory = tree_find_ihandle_property(me, "/chosen/memory");
|
|
|
|
/* for the htab, just allocate space for it */
|
|
if (strcmp(device_name(me), "htab") == 0) {
|
|
unsigned_word address = device_find_integer_property(me, "real-address");
|
|
unsigned_word length = device_find_integer_property(me, "nr-bytes");
|
|
unsigned_word base = claim_memory(me, memory, address, length);
|
|
if (base == -1 || base != address)
|
|
device_error(me, "cannot allocate hash table");
|
|
}
|
|
|
|
/* for the pte, do all the real work */
|
|
if (strcmp(device_name(me), "pte") == 0) {
|
|
unsigned32 htaborg;
|
|
unsigned32 htabmask;
|
|
|
|
htab_decode_hash_table(me, &htaborg, &htabmask);
|
|
|
|
if (device_find_property(me, "file-name") != NULL) {
|
|
/* map in a binary */
|
|
unsigned pte_wimg = device_find_integer_property(me, "wimg");
|
|
unsigned pte_pp = device_find_integer_property(me, "pp");
|
|
const char *file_name = device_find_string_property(me, "file-name");
|
|
if (device_find_property(me, "real-address") != NULL) {
|
|
unsigned32 pte_ra = device_find_integer_property(me, "real-address");
|
|
DTRACE(htab, ("pte - ra=0x%lx, wimg=%ld, pp=%ld, file-name=%s\n",
|
|
(unsigned long)pte_ra,
|
|
(unsigned long)pte_wimg,
|
|
(long)pte_pp,
|
|
file_name));
|
|
htab_map_binary(me, memory, pte_ra, pte_wimg, pte_pp, file_name,
|
|
htaborg, htabmask);
|
|
}
|
|
else {
|
|
DTRACE(htab, ("pte - wimg=%ld, pp=%ld, file-name=%s\n",
|
|
(unsigned long)pte_wimg,
|
|
(long)pte_pp,
|
|
file_name));
|
|
htab_map_binary(me, memory, -1, pte_wimg, pte_pp, file_name,
|
|
htaborg, htabmask);
|
|
}
|
|
}
|
|
else {
|
|
/* handle a normal mapping definition */
|
|
unsigned64 pte_va = 0;
|
|
unsigned32 pte_ra = device_find_integer_property(me, "real-address");
|
|
unsigned pte_nr_bytes = device_find_integer_property(me, "nr-bytes");
|
|
unsigned pte_wimg = device_find_integer_property(me, "wimg");
|
|
unsigned pte_pp = device_find_integer_property(me, "pp");
|
|
signed_cell partial_va;
|
|
int i;
|
|
for (i = 0;
|
|
device_find_integer_array_property(me, "virtual-address", i, &partial_va);
|
|
i++) {
|
|
pte_va = (pte_va << WITH_TARGET_WORD_BITSIZE) | (unsigned_cell)partial_va;
|
|
}
|
|
DTRACE(htab, ("pte - ra=0x%lx, wimg=%ld, pp=%ld, va=0x%lx, nr_bytes=%ld\n",
|
|
(unsigned long)pte_ra,
|
|
(long)pte_wimg,
|
|
(long)pte_pp,
|
|
(unsigned long)pte_va,
|
|
(long)pte_nr_bytes));
|
|
htab_map_region(me, memory, pte_ra, pte_va, pte_nr_bytes, pte_wimg, pte_pp,
|
|
htaborg, htabmask);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static device_callbacks const htab_callbacks = {
|
|
{ NULL, htab_init_data_callback, },
|
|
{ NULL, }, /* address */
|
|
{ NULL, }, /* IO */
|
|
{ passthrough_device_dma_read_buffer,
|
|
passthrough_device_dma_write_buffer, },
|
|
{ NULL, }, /* interrupt */
|
|
{ generic_device_unit_decode,
|
|
generic_device_unit_encode, },
|
|
};
|
|
|
|
const device_descriptor hw_htab_device_descriptor[] = {
|
|
{ "htab", NULL, &htab_callbacks },
|
|
{ "pte", NULL, &htab_callbacks }, /* yep - uses htab's table */
|
|
{ NULL },
|
|
};
|
|
|
|
#endif /* _HW_HTAB_C_ */
|