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[arch][arm64] add routine to read the boot EL

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This commit is contained in:
Travis Geiselbrecht
2025-10-14 00:45:03 -07:00
parent 22d676ac0f
commit 50864eda02
2 changed files with 20 additions and 0 deletions
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9
arch/arm64/arch.c
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@@ -25,6 +25,9 @@
#define LOCAL_TRACE 0
/* Defined in start.S. */
extern uint64_t arm64_boot_el;
// initial setup per cpu immediately after entering C code
void arm64_early_init_percpu(void) {
// set the vector base
@@ -76,6 +79,12 @@ void arch_early_init(void) {
// called after the kernel has been initialized and threading is enabled on the boot cpu
void arch_init(void) {
arm64_mp_init();
dprintf(INFO, "ARM64: boot EL%llu\n", arm64_get_boot_el());
}
uint64_t arm64_get_boot_el(void) {
return arm64_boot_el >> 2;
}
void arch_quiesce(void) {

11
arch/arm64/include/arch/arm64.h
View File

@@ -34,6 +34,8 @@ __BEGIN_CDECLS
void arm64_context_switch(vaddr_t *old_sp, vaddr_t new_sp);
uint64_t arm64_get_boot_el(void);
/* exception handling */
struct arm64_iframe_long {
uint64_t r[30];
@@ -81,5 +83,14 @@ void arm64_local_invalidate_cache_all(void);
void arm64_local_clean_invalidate_cache_all(void);
void arm64_local_clean_cache_all(void);
/* Current Exception Level values, as contained in CurrentEL */
#define CurrentEL_EL1 (1 << 2)
#define CurrentEL_EL2 (2 << 2)
static inline bool arm64_is_kernel_in_hyp_mode(void) {
return ARM64_READ_SYSREG(CURRENTEL) == CurrentEL_EL2;
}
__END_CDECLS