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PPC: BookE: Implement EPR SPR 

On the e500 series, accessing SPR_EPR magically turns into an access at
that CPU's IACK register on the MPIC. Implement that logic to get kernels
that make use of that feature work.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2012-06-20 21:27:02 +02:00
parent e42a61f185
commit 2a7a47fc6c
5 changed files with 39 additions and 0 deletions
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1
hw/ppce500_mpc8544ds.c
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@ -469,6 +469,7 @@ static void mpc8544ds_init(ram_addr_t ram_size,
irqs[i][OPENPIC_OUTPUT_INT] = input[PPCE500_INPUT_INT];
irqs[i][OPENPIC_OUTPUT_CINT] = input[PPCE500_INPUT_CINT];
env->spr[SPR_BOOKE_PIR] = env->cpu_index = i;
env->mpic_cpu_base = MPC8544_MPIC_REGS_BASE + 0x20000;
ppc_booke_timers_init(env, 400000000, PPC_TIMER_E500);

1
target-ppc/Makefile.objs
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@ -9,3 +9,4 @@ obj-y += mmu_helper.o
obj-y += timebase_helper.o
obj-y += misc_helper.o
obj-y += mem_helper.o
obj-y += mpic_helper.o

1
target-ppc/cpu.h
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@ -1066,6 +1066,7 @@ struct CPUPPCState {
target_ulong ivor_mask;
target_ulong ivpr_mask;
target_ulong hreset_vector;
target_phys_addr_t mpic_cpu_base;
#endif
/* Those resources are used only during code translation */

1
target-ppc/helper.h
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@ -405,6 +405,7 @@ DEF_HELPER_2(store_40x_dbcr0, void, env, tl)
DEF_HELPER_2(store_40x_sler, void, env, tl)
DEF_HELPER_2(store_booke_tcr, void, env, tl)
DEF_HELPER_2(store_booke_tsr, void, env, tl)
DEF_HELPER_1(load_epr, tl, env)
DEF_HELPER_3(store_ibatl, void, env, i32, tl)
DEF_HELPER_3(store_ibatu, void, env, i32, tl)
DEF_HELPER_3(store_dbatl, void, env, i32, tl)

35
target-ppc/mpic_helper.c Normal file
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@ -0,0 +1,35 @@
/*
* PowerPC emulation helpers for QEMU.
*
* Copyright (c) 2003-2007 Jocelyn Mayer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "cpu.h"
#include "helper.h"
/*****************************************************************************/
/* SPR accesses */
#if !defined(CONFIG_USER_ONLY)
/*
* This is an ugly helper for EPR, which is basically the same as accessing
* the IACK (PIAC) register on the MPIC. Because we model the MPIC as a device
* that can only talk to the CPU through MMIO, let's access it that way!
*/
target_ulong helper_load_epr(CPUPPCState *env)
{
return ldl_phys(env->mpic_cpu_base + 0xA0);
}
#endif