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target/mips: Implement segmentation control 

Implement the optional segmentation control feature in the virtual to
physical address translation code.

The fixed legacy segment and xkphys handling is replaced with a dynamic
layout based on the segmentation control registers (which should be set
up even when the feature is not exposed to the guest).

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Yongbok Kim <yongbok.kim@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Yongbok Kim <yongbok.kim@imgtec.com>
[yongbok.kim@imgtec.com:
  cosmetic changes]
Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>
This commit is contained in:
James Hogan 2017-07-18 12:55:57 +01:00 committed by Yongbok Kim
parent cec56a733d
commit 480e79aedd
1 changed files with 152 additions and 39 deletions
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191
target/mips/helper.c
View File

@ -107,15 +107,107 @@ int r4k_map_address (CPUMIPSState *env, hwaddr *physical, int *prot,
return TLBRET_NOMATCH;
}
static int is_seg_am_mapped(unsigned int am, bool eu, int mmu_idx)
{
/*
* Interpret access control mode and mmu_idx.
* AdE? TLB?
* AM K S U E K S U E
* UK 0 0 1 1 0 0 - - 0
* MK 1 0 1 1 0 1 - - !eu
* MSK 2 0 0 1 0 1 1 - !eu
* MUSK 3 0 0 0 0 1 1 1 !eu
* MUSUK 4 0 0 0 0 0 1 1 0
* USK 5 0 0 1 0 0 0 - 0
* - 6 - - - - - - - -
* UUSK 7 0 0 0 0 0 0 0 0
*/
int32_t adetlb_mask;
switch (mmu_idx) {
case 3 /* ERL */:
/* If EU is set, always unmapped */
if (eu) {
return 0;
}
/* fall through */
case MIPS_HFLAG_KM:
/* Never AdE, TLB mapped if AM={1,2,3} */
adetlb_mask = 0x70000000;
goto check_tlb;
case MIPS_HFLAG_SM:
/* AdE if AM={0,1}, TLB mapped if AM={2,3,4} */
adetlb_mask = 0xc0380000;
goto check_ade;
case MIPS_HFLAG_UM:
/* AdE if AM={0,1,2,5}, TLB mapped if AM={3,4} */
adetlb_mask = 0xe4180000;
/* fall through */
check_ade:
/* does this AM cause AdE in current execution mode */
if ((adetlb_mask << am) < 0) {
return TLBRET_BADADDR;
}
adetlb_mask <<= 8;
/* fall through */
check_tlb:
/* is this AM mapped in current execution mode */
return ((adetlb_mask << am) < 0);
default:
assert(0);
return TLBRET_BADADDR;
};
}
static int get_seg_physical_address(CPUMIPSState *env, hwaddr *physical,
int *prot, target_ulong real_address,
int rw, int access_type, int mmu_idx,
unsigned int am, bool eu,
target_ulong segmask,
hwaddr physical_base)
{
int mapped = is_seg_am_mapped(am, eu, mmu_idx);
if (mapped < 0) {
/* is_seg_am_mapped can report TLBRET_BADADDR */
return mapped;
} else if (mapped) {
/* The segment is TLB mapped */
return env->tlb->map_address(env, physical, prot, real_address, rw,
access_type);
} else {
/* The segment is unmapped */
*physical = physical_base | (real_address & segmask);
*prot = PAGE_READ | PAGE_WRITE;
return TLBRET_MATCH;
}
}
static int get_segctl_physical_address(CPUMIPSState *env, hwaddr *physical,
int *prot, target_ulong real_address,
int rw, int access_type, int mmu_idx,
uint16_t segctl, target_ulong segmask)
{
unsigned int am = (segctl & CP0SC_AM_MASK) >> CP0SC_AM;
bool eu = (segctl >> CP0SC_EU) & 1;
hwaddr pa = ((hwaddr)segctl & CP0SC_PA_MASK) << 20;
return get_seg_physical_address(env, physical, prot, real_address, rw,
access_type, mmu_idx, am, eu, segmask,
pa & ~(hwaddr)segmask);
}
static int get_physical_address (CPUMIPSState *env, hwaddr *physical,
int *prot, target_ulong real_address,
int rw, int access_type, int mmu_idx)
{
/* User mode can only access useg/xuseg */
#if defined(TARGET_MIPS64)
int user_mode = mmu_idx == MIPS_HFLAG_UM;
int supervisor_mode = mmu_idx == MIPS_HFLAG_SM;
int kernel_mode = !user_mode && !supervisor_mode;
#if defined(TARGET_MIPS64)
int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
@ -148,12 +240,16 @@ static int get_physical_address (CPUMIPSState *env, hwaddr *physical,
if (address <= USEG_LIMIT) {
/* useg */
if (env->CP0_Status & (1 << CP0St_ERL)) {
*physical = address & 0xFFFFFFFF;
*prot = PAGE_READ | PAGE_WRITE;
uint16_t segctl;
if (address >= 0x40000000UL) {
segctl = env->CP0_SegCtl2;
} else {
ret = env->tlb->map_address(env, physical, prot, real_address, rw, access_type);
segctl = env->CP0_SegCtl2 >> 16;
}
ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
access_type, mmu_idx, segctl,
0x3FFFFFFF);
#if defined(TARGET_MIPS64)
} else if (address < 0x4000000000000000ULL) {
/* xuseg */
@ -172,10 +268,33 @@ static int get_physical_address (CPUMIPSState *env, hwaddr *physical,
}
} else if (address < 0xC000000000000000ULL) {
/* xkphys */
if (kernel_mode && KX &&
(address & 0x07FFFFFFFFFFFFFFULL) <= env->PAMask) {
*physical = address & env->PAMask;
*prot = PAGE_READ | PAGE_WRITE;
if ((address & 0x07FFFFFFFFFFFFFFULL) <= env->PAMask) {
/* KX/SX/UX bit to check for each xkphys EVA access mode */
static const uint8_t am_ksux[8] = {
[CP0SC_AM_UK] = (1u << CP0St_KX),
[CP0SC_AM_MK] = (1u << CP0St_KX),
[CP0SC_AM_MSK] = (1u << CP0St_SX),
[CP0SC_AM_MUSK] = (1u << CP0St_UX),
[CP0SC_AM_MUSUK] = (1u << CP0St_UX),
[CP0SC_AM_USK] = (1u << CP0St_SX),
[6] = (1u << CP0St_KX),
[CP0SC_AM_UUSK] = (1u << CP0St_UX),
};
unsigned int am = CP0SC_AM_UK;
unsigned int xr = (env->CP0_SegCtl2 & CP0SC2_XR_MASK) >> CP0SC2_XR;
if (xr & (1 << ((address >> 59) & 0x7))) {
am = (env->CP0_SegCtl1 & CP0SC1_XAM_MASK) >> CP0SC1_XAM;
}
/* Does CP0_Status.KX/SX/UX permit the access mode (am) */
if (env->CP0_Status & am_ksux[am]) {
ret = get_seg_physical_address(env, physical, prot,
real_address, rw, access_type,
mmu_idx, am, false, env->PAMask,
0);
} else {
ret = TLBRET_BADADDR;
}
} else {
ret = TLBRET_BADADDR;
}
@ -190,35 +309,25 @@ static int get_physical_address (CPUMIPSState *env, hwaddr *physical,
#endif
} else if (address < (int32_t)KSEG1_BASE) {
/* kseg0 */
if (kernel_mode) {
*physical = address - (int32_t)KSEG0_BASE;
*prot = PAGE_READ | PAGE_WRITE;
} else {
ret = TLBRET_BADADDR;
}
ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
access_type, mmu_idx,
env->CP0_SegCtl1 >> 16, 0x1FFFFFFF);
} else if (address < (int32_t)KSEG2_BASE) {
/* kseg1 */
if (kernel_mode) {
*physical = address - (int32_t)KSEG1_BASE;
*prot = PAGE_READ | PAGE_WRITE;
} else {
ret = TLBRET_BADADDR;
}
ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
access_type, mmu_idx,
env->CP0_SegCtl1, 0x1FFFFFFF);
} else if (address < (int32_t)KSEG3_BASE) {
/* sseg (kseg2) */
if (supervisor_mode || kernel_mode) {
ret = env->tlb->map_address(env, physical, prot, real_address, rw, access_type);
} else {
ret = TLBRET_BADADDR;
}
ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
access_type, mmu_idx,
env->CP0_SegCtl0 >> 16, 0x1FFFFFFF);
} else {
/* kseg3 */
/* XXX: debug segment is not emulated */
if (kernel_mode) {
ret = env->tlb->map_address(env, physical, prot, real_address, rw, access_type);
} else {
ret = TLBRET_BADADDR;
}
ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
access_type, mmu_idx,
env->CP0_SegCtl0, 0x1FFFFFFF);
}
return ret;
}
@ -722,15 +831,17 @@ void mips_cpu_do_interrupt(CPUState *cs)
#if defined(TARGET_MIPS64)
int R = env->CP0_BadVAddr >> 62;
int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
if (((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX)) &&
(!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F))))
if ((R != 0 || UX) && (R != 3 || KX) &&
(!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)))) {
offset = 0x080;
else
} else {
#endif
offset = 0x000;
#if defined(TARGET_MIPS64)
}
#endif
}
goto set_EPC;
case EXCP_TLBS:
@ -741,15 +852,17 @@ void mips_cpu_do_interrupt(CPUState *cs)
#if defined(TARGET_MIPS64)
int R = env->CP0_BadVAddr >> 62;
int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
if (((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX)) &&
(!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F))))
if ((R != 0 || UX) && (R != 3 || KX) &&
(!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)))) {
offset = 0x080;
else
} else {
#endif
offset = 0x000;
#if defined(TARGET_MIPS64)
}
#endif
}
goto set_EPC;
case EXCP_AdEL: