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ppcemu: add PTEG integrity check.

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This commit is contained in:
Maxim Poliakovski 2020-01-03 20:28:37 +01:00
parent 74882c8082
commit 7bae155fc3
2 changed files with 25 additions and 0 deletions
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22
cpu/ppc/ppcmmu.cpp
View File

@ -172,12 +172,34 @@ static bool search_pteg(uint8_t *pteg_addr, uint8_t **ret_pte_addr,
uint32_t pte_check = 0x80000000 | (vsid << 7) | (pteg_num << 6) |
(page_index >> 10);
#ifdef MMU_INTEGRITY_CHECKS
/* PTEG integrity check that ensures that all matching PTEs have
identical RPN, WIMG and PP bits (PPC PEM 32-bit 7.6.2, rule 5). */
uint32_t pte_word2_check;
bool match_found = false;
for (int i = 0; i < 8; i++, pteg_addr += 8) {
if (pte_check == READ_DWORD_BE(pteg_addr)) {
if (match_found) {
if ((READ_DWORD_BE(pteg_addr) & 0xFFFFF07B) != pte_word2_check) {
printf("Multiple PTEs with different RPN/WIMG/PP found!\n");
exit(-1);
}
} else {
/* isolate RPN, WIMG and PP fields */
pte_word2_check = READ_DWORD_BE(pteg_addr) & 0xFFFFF07B;
*ret_pte_addr = pteg_addr;
}
}
}
#else
for (int i = 0; i < 8; i++, pteg_addr += 8) {
if (pte_check == READ_DWORD_BE(pteg_addr)) {
*ret_pte_addr = pteg_addr;
return true;
}
}
#endif
return false;
}

3
cpu/ppc/ppcmmu.h
View File

@ -13,6 +13,9 @@
#include <vector>
#include <array>
/* Uncomment this to exhaustive MMU integrity checks. */
//#define MMU_INTEGRITY_CHECKS
/** generic PowerPC BAT descriptor (MMU internal state) */
typedef struct PPC_BAT_entry {
uint8_t access; /* copy of Vs | Vp bits */