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kern: set EL2 id registers on deprivilege

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This commit is contained in:
Michael Scire 2020-12-01 15:57:45 -08:00
parent b421e3eadb
commit 4f00303daf
1 changed files with 30 additions and 0 deletions
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30
mesosphere/kernel/source/arch/arm64/init/start.s
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@ -249,6 +249,27 @@ _ZN3ams4kern4init16JumpFromEL2ToEL1Ev:
bl _ZN3ams4kern4arch5arm643cpu32FlushEntireDataCacheWithoutStackEv
/* Setup system registers for deprivileging. */
/* Check if we're on cortex A57 or A53. If we are, set ACTLR_EL2. */
mrs x1, midr_el1
/* Is the manufacturer ID 'A' (ARM)? */
ubfx x2, x1, #0x18, #8
cmp x2, #0x41
b.ne 2f
/* Is the board ID Cortex-A57? */
ubfx x2, x1, #4, #0xC
mov x3, #0xD07
cmp x2, x3
b.eq 1f
/* Is the board ID Cortex-A53? */
mov x3, #0xD03
cmp x2, x3
b.ne 2f
1:
/* ACTLR_EL2: */
/* - CPUACTLR access control = 1 */
/* - CPUECTLR access control = 1 */
@ -258,6 +279,7 @@ _ZN3ams4kern4init16JumpFromEL2ToEL1Ev:
mov x0, #0x73
msr actlr_el2, x0
2:
/* HCR_EL2: */
/* - RW = 1 (el1 is aarch64) */
mov x0, #0x80000000
@ -275,6 +297,14 @@ _ZN3ams4kern4init16JumpFromEL2ToEL1Ev:
mov x0, #0xFFFFFFFF
msr dacr32_el2, x0
/* Set VPIDR_EL2 = MIDR_EL1 */
mrs x0, midr_el1
msr vpidr_el2, x0
/* SET VMPIDR_EL2 = MPIDR_EL1 */
mrs x0, mpidr_el1
msr vmpidr_el2, x0
/* SPSR_EL2: */
/* - EL1h */
/* - IRQ masked */