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powerpc: Improve emulation of the BookE MMU 

Improve the emulation of the BookE MMU to be able to boot linux
on virtex5 boards.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
This commit is contained in:
Edgar E. Iglesias 2010-09-20 19:06:32 +02:00
parent c973a36d17
commit a586e548fb
2 changed files with 33 additions and 8 deletions
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3
target-ppc/cpu.h
View File

@ -453,6 +453,9 @@ struct ppc_slb_t {
#endif
#endif
/* Exception state register bits definition */
#define ESR_ST 23 /* Exception was caused by a store type access. */
enum {
POWERPC_FLAG_NONE = 0x00000000,
/* Flag for MSR bit 25 signification (VRE/SPE) */

38
target-ppc/helper.c
View File

@ -1325,8 +1325,15 @@ int get_physical_address (CPUState *env, mmu_ctx_t *ctx, target_ulong eaddr,
#endif
if ((access_type == ACCESS_CODE && msr_ir == 0) ||
(access_type != ACCESS_CODE && msr_dr == 0)) {
/* No address translation */
ret = check_physical(env, ctx, eaddr, rw);
if (env->mmu_model == POWERPC_MMU_BOOKE) {
/* The BookE MMU always performs address translation. The
IS and DS bits only affect the address space. */
ret = mmubooke_get_physical_address(env, ctx, eaddr,
rw, access_type);
} else {
/* No address translation. */
ret = check_physical(env, ctx, eaddr, rw);
}
} else {
ret = -1;
switch (env->mmu_model) {
@ -1444,8 +1451,9 @@ int cpu_ppc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
env->error_code = 0x40000000;
break;
case POWERPC_MMU_BOOKE:
/* XXX: TODO */
cpu_abort(env, "BookE MMU model is not implemented\n");
env->exception_index = POWERPC_EXCP_ITLB;
env->error_code = 0;
env->spr[SPR_BOOKE_DEAR] = address;
return -1;
case POWERPC_MMU_BOOKE_FSL:
/* XXX: TODO */
@ -1471,6 +1479,9 @@ int cpu_ppc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
break;
case -3:
/* No execute protection violation */
if (env->mmu_model == POWERPC_MMU_BOOKE) {
env->spr[SPR_BOOKE_ESR] = 0x00000000;
}
env->exception_index = POWERPC_EXCP_ISI;
env->error_code = 0x10000000;
break;
@ -1556,8 +1567,10 @@ int cpu_ppc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
cpu_abort(env, "MPC8xx MMU model is not implemented\n");
break;
case POWERPC_MMU_BOOKE:
/* XXX: TODO */
cpu_abort(env, "BookE MMU model is not implemented\n");
env->exception_index = POWERPC_EXCP_DTLB;
env->error_code = 0;
env->spr[SPR_BOOKE_DEAR] = address;
env->spr[SPR_BOOKE_ESR] = rw ? 1 << ESR_ST : 0;
return -1;
case POWERPC_MMU_BOOKE_FSL:
/* XXX: TODO */
@ -1582,6 +1595,9 @@ int cpu_ppc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
if (rw) {
env->spr[SPR_40x_ESR] |= 0x00800000;
}
} else if (env->mmu_model == POWERPC_MMU_BOOKE) {
env->spr[SPR_BOOKE_DEAR] = address;
env->spr[SPR_BOOKE_ESR] = rw ? 1 << ESR_ST : 0;
} else {
env->spr[SPR_DAR] = address;
if (rw == 1) {
@ -1848,8 +1864,7 @@ void ppc_tlb_invalidate_all (CPUPPCState *env)
cpu_abort(env, "MPC8xx MMU model is not implemented\n");
break;
case POWERPC_MMU_BOOKE:
/* XXX: TODO */
cpu_abort(env, "BookE MMU model is not implemented\n");
tlb_flush(env, 1);
break;
case POWERPC_MMU_BOOKE_FSL:
/* XXX: TODO */
@ -2607,6 +2622,13 @@ static inline void powerpc_excp(CPUState *env, int excp_model, int excp)
/* Reset exception state */
env->exception_index = POWERPC_EXCP_NONE;
env->error_code = 0;
if (env->mmu_model == POWERPC_MMU_BOOKE) {
/* XXX: The BookE changes address space when switching modes,
we should probably implement that as different MMU indexes,
but for the moment we do it the slow way and flush all. */
tlb_flush(env, 1);
}
}
void do_interrupt (CPUState *env)