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accel/tcg: Issue wider aligned i/o in do_{ld,st}_mmio_*

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If the address and size are aligned, send larger chunks
to the memory subsystem.  This will be required to make
more use of these helpers.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-08-01 10:10:45 -07:00
parent 1966855e56
commit 190aba803f
1 changed files with 69 additions and 7 deletions
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76
accel/tcg/cputlb.c
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@ -2081,10 +2081,40 @@ static uint64_t do_ld_mmio_beN(CPUArchState *env, CPUTLBEntryFull *full,
uint64_t ret_be, vaddr addr, int size,
int mmu_idx, MMUAccessType type, uintptr_t ra)
{
for (int i = 0; i < size; i++) {
uint8_t x = io_readx(env, full, mmu_idx, addr + i, ra, type, MO_UB);
ret_be = (ret_be << 8) | x;
}
uint64_t t;
tcg_debug_assert(size > 0 && size <= 8);
do {
/* Read aligned pieces up to 8 bytes. */
switch ((size | (int)addr) & 7) {
case 1:
case 3:
case 5:
case 7:
t = io_readx(env, full, mmu_idx, addr, ra, type, MO_UB);
ret_be = (ret_be << 8) | t;
size -= 1;
addr += 1;
break;
case 2:
case 6:
t = io_readx(env, full, mmu_idx, addr, ra, type, MO_BEUW);
ret_be = (ret_be << 16) | t;
size -= 2;
addr += 2;
break;
case 4:
t = io_readx(env, full, mmu_idx, addr, ra, type, MO_BEUL);
ret_be = (ret_be << 32) | t;
size -= 4;
addr += 4;
break;
case 0:
return io_readx(env, full, mmu_idx, addr, ra, type, MO_BEUQ);
default:
qemu_build_not_reached();
}
} while (size);
return ret_be;
}
@ -2680,9 +2710,41 @@ static uint64_t do_st_mmio_leN(CPUArchState *env, CPUTLBEntryFull *full,
uint64_t val_le, vaddr addr, int size,
int mmu_idx, uintptr_t ra)
{
for (int i = 0; i < size; i++, val_le >>= 8) {
io_writex(env, full, mmu_idx, val_le, addr + i, ra, MO_UB);
}
tcg_debug_assert(size > 0 && size <= 8);
do {
/* Store aligned pieces up to 8 bytes. */
switch ((size | (int)addr) & 7) {
case 1:
case 3:
case 5:
case 7:
io_writex(env, full, mmu_idx, val_le, addr, ra, MO_UB);
val_le >>= 8;
size -= 1;
addr += 1;
break;
case 2:
case 6:
io_writex(env, full, mmu_idx, val_le, addr, ra, MO_LEUW);
val_le >>= 16;
size -= 2;
addr += 2;
break;
case 4:
io_writex(env, full, mmu_idx, val_le, addr, ra, MO_LEUL);
val_le >>= 32;
size -= 4;
addr += 4;
break;
case 0:
io_writex(env, full, mmu_idx, val_le, addr, ra, MO_LEUQ);
return 0;
default:
qemu_build_not_reached();
}
} while (size);
return val_le;
}