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ppcmmu: Fix mmio read/write offset calculation.

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For TLBs referencing an mmio region, calculate an offset that will translate a guest virtual address to an offset in the mmio region.
This commit is contained in:
joevt 2023-07-23 03:42:40 -07:00
parent 16123dea45
commit ac64f9e30d
2 changed files with 16 additions and 11 deletions
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15
cpu/ppc/ppcmmu.cpp
View File

@ -607,6 +607,7 @@ static TLBEntry* dtlb2_refill(uint32_t guest_va, int is_write)
if (reg_desc->type & RT_MMIO) { // MMIO region
tlb_entry->flags = flags | TLBFlags::PAGE_IO;
tlb_entry->reg_desc = reg_desc;
tlb_entry->reg_va_offs = (phys_addr - reg_desc->start) - guest_va;
} else { // memory region backed by host memory
tlb_entry->flags = flags | TLBFlags::PAGE_MEM;
tlb_entry->host_va_offs_r = (int64_t)reg_desc->mem_ptr - guest_va +
@ -1042,10 +1043,10 @@ inline T mmu_read_vmem(uint32_t guest_va)
{
return (
((T)tlb2_entry->reg_desc->devobj->read(tlb2_entry->reg_desc->start,
guest_va - tlb2_entry->reg_desc->start,
static_cast<uint32_t>(tlb2_entry->reg_va_offs + guest_va),
4) << 32) |
tlb2_entry->reg_desc->devobj->read(tlb2_entry->reg_desc->start,
guest_va + 4 - tlb2_entry->reg_desc->start,
static_cast<uint32_t>(tlb2_entry->reg_va_offs + guest_va) + 4,
4)
);
}
@ -1053,7 +1054,7 @@ inline T mmu_read_vmem(uint32_t guest_va)
else {
return (
tlb2_entry->reg_desc->devobj->read(tlb2_entry->reg_desc->start,
guest_va - tlb2_entry->reg_desc->start,
static_cast<uint32_t>(tlb2_entry->reg_va_offs + guest_va),
sizeof(T))
);
}
@ -1167,16 +1168,16 @@ inline void mmu_write_vmem(uint32_t guest_va, T value)
}
{
tlb2_entry->reg_desc->devobj->write(tlb2_entry->reg_desc->start,
guest_va - tlb2_entry->reg_desc->start,
static_cast<uint32_t>(tlb2_entry->reg_va_offs + guest_va),
value >> 32, 4);
tlb2_entry->reg_desc->devobj->write(tlb2_entry->reg_desc->start,
guest_va + 4 - tlb2_entry->reg_desc->start,
static_cast<uint32_t>(tlb2_entry->reg_va_offs + guest_va) + 4,
(uint32_t)value, 4);
}
}
else {
tlb2_entry->reg_desc->devobj->write(tlb2_entry->reg_desc->start,
guest_va - tlb2_entry->reg_desc->start,
static_cast<uint32_t>(tlb2_entry->reg_va_offs + guest_va),
value, sizeof(T));
}
return;
@ -1686,7 +1687,7 @@ static inline uint64_t tlb_translate_addr(uint32_t guest_va)
tlb1_entry->host_va_offs_r = tlb2_entry->host_va_offs_r;
return tlb1_entry->host_va_offs_r + guest_va;
} else { // an attempt to access a memory-mapped device
return guest_va - tlb2_entry->reg_desc->start;
return tlb2_entry->reg_va_offs + guest_va;
}
}
}

12
cpu/ppc/ppcmmu.h
View File

@ -82,11 +82,15 @@ typedef struct TLBEntry {
uint16_t flags;
uint16_t lru_bits;
union {
int64_t host_va_offs_r;
AddressMapEntry* reg_desc;
struct {
int64_t host_va_offs_r;
int64_t host_va_offs_w;
};
struct {
AddressMapEntry* reg_desc;
int64_t reg_va_offs;
};
};
int64_t host_va_offs_w;
int64_t unused;
} TLBEntry;
enum TLBFlags : uint16_t {