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!823 添加一些启动注释 

Merge pull request !823 from Zhaotianyu/0309reset
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openharmony_ci 2022-03-10 04:06:28 +00:00 committed by Gitee
parent b797f50596 29dde5d752
commit 0fb16312dc
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GPG Key ID: 173E9B9CA92EEF8F
2 changed files with 14 additions and 12 deletions
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13
arch/arm/arm/src/startup/reset_vector_mp.S
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@ -121,8 +121,9 @@ reset_vector:
mcr p15, 0, r0, c13, c0, 4
/* do some early cpu setup: i/d cache disable, mmu disabled */
mrc p15, 0, r0, c1, c0, 0
bic r0, #(1<<12)
bic r0, #(1<<2 | 1<<0)
bic r0, #(1 << 12) /* i cache */
bic r0, #(1 << 2) /* d cache */
bic r0, #(1 << 0) /* mmu */
mcr p15, 0, r0, c1, c0, 0
/* enable fpu+neon */
@ -282,11 +283,11 @@ mmu_setup:
mcr p15, 0, r12, c1, c0, 1 /* ACTLR, Auxlliary Control Register */
dsb
mrc p15, 0, r12, c1, c0, 0
bic r12, #(1 << 29 | 1 << 28)
orr r12, #(1 << 0)
bic r12, #(1 << 29 | 1 << 28) /* Disable TRE/AFE */
orr r12, #(1 << 0) /* mmu enable */
bic r12, #(1 << 1)
orr r12, #(1 << 2)
orr r12, #(1 << 12)
orr r12, #(1 << 2) /* D cache enable */
orr r12, #(1 << 12) /* I cache enable */
mcr p15, 0, r12, c1, c0, 0 /* Set SCTLR with r12: Turn on the MMU, I/D cache Disable TRE/AFE */
isb
ldr pc, =1f /* Convert to VA */

13
arch/arm/arm/src/startup/reset_vector_up.S
View File

@ -101,8 +101,9 @@ __exception_handlers:
reset_vector:
/* do some early cpu setup: i/d cache disable, mmu disabled */
mrc p15, 0, r0, c1, c0, 0
bic r0, #(1<<12)
bic r0, #(1<<2 | 1<<0)
bic r0, #(1 << 12) /* i cache */
bic r0, #(1 << 2) /* d cache */
bic r0, #(1 << 0) /* mmu */
mcr p15, 0, r0, c1, c0, 0
/* enable fpu+neon */
@ -269,11 +270,11 @@ mmu_setup:
isb
mrc p15, 0, r12, c1, c0, 0
bic r12, #(1 << 29 | 1 << 28)
orr r12, #(1 << 0)
bic r12, #(1 << 29 | 1 << 28) /* Disable TRE/AFE */
orr r12, #(1 << 0) /* mmu enable */
bic r12, #(1 << 1)
orr r12, #(1 << 2)
orr r12, #(1 << 12)
orr r12, #(1 << 2) /* D cache enable */
orr r12, #(1 << 12) /* I cache enable */
mcr p15, 0, r12, c1, c0, 0 /* Set SCTLR with r12: Turn on the MMU, I/D cache Disable TRE/AFE */
isb