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kern: trivially optimize userspace io memory write

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This commit is contained in:
Michael Scire 2021-04-07 10:09:35 -07:00
parent d7c63a37bd
commit b0a8f6f86a
1 changed files with 3 additions and 6 deletions
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9
libraries/libmesosphere/source/arch/arm64/kern_userspace_memory_access_asm.s
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@ -758,7 +758,6 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess18WriteIoMemory32BitEPvPKvm:
mov x8, x30
1: /* Read the word from normal memory. */
mov x30, x8
ldtr w9, [x5]
/* Set our return address so that on read failure we continue. */
@ -769,7 +768,7 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess18WriteIoMemory32BitEPvPKvm:
dsb sy
2: /* Continue. */
nop
mov x30, x8
/* Advance. */
add x4, x4, #4
@ -801,7 +800,6 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess18WriteIoMemory16BitEPvPKvm:
mov x8, x30
1: /* Read the word from normal memory. */
mov x30, x8
ldtrh w9, [x5]
/* Set our return address so that on read failure we continue. */
@ -812,7 +810,7 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess18WriteIoMemory16BitEPvPKvm:
dsb sy
2: /* Continue. */
nop
mov x30, x8
/* Advance. */
add x4, x4, #2
@ -844,7 +842,6 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess17WriteIoMemory8BitEPvPKvm:
mov x8, x30
1: /* Read the word from normal memory. */
mov x30, x8
ldtrb w9, [x5]
/* Set our return address so that on read failure we continue. */
@ -855,7 +852,7 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess17WriteIoMemory8BitEPvPKvm:
dsb sy
2: /* Continue. */
nop
mov x30, x8
/* Advance. */
add x4, x4, #1