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arm: Use armv8_switch_to_el1 env to switch to EL1 

Use the environment variable armv8_switch_to_el1 to determine whether
to switch to EL1 at runtime. This is an alternative to the
CONFIG_ARMV8_SWITCH_TO_EL1 compile-time option.

The environment variable will be ineffective if the ARMV8_MULTIENTRY
config is used.

This is required by the Armv8r64 architecture, which must be able to
boot at S-EL1 for Linux but may need to boot at other ELs for other
systems.

Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
This commit is contained in:
Peter Hoyes 2021-08-19 16:53:13 +01:00 committed by Tom Rini
parent b53bbca63b
commit 30e5a449e8
1 changed files with 25 additions and 15 deletions
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22
arch/arm/lib/bootm.c
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@ -317,7 +317,6 @@ __weak void update_os_arch_secondary_cores(uint8_t os_arch)
{ {
} }
#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
static void switch_to_el1(void) static void switch_to_el1(void)
{ {
if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) && if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
@ -332,7 +331,6 @@ static void switch_to_el1(void)
ES_TO_AARCH64); ES_TO_AARCH64);
} }
#endif #endif
#endif
/* Subcommand: GO */ /* Subcommand: GO */
static void boot_jump_linux(bootm_headers_t *images, int flag) static void boot_jump_linux(bootm_headers_t *images, int flag)
@ -359,21 +357,33 @@ static void boot_jump_linux(bootm_headers_t *images, int flag)
update_os_arch_secondary_cores(images->os.arch); update_os_arch_secondary_cores(images->os.arch);
#ifdef CONFIG_ARMV8_MULTIENTRY
int armv8_switch_to_el1 = -1;
#else
int armv8_switch_to_el1 = env_get_yesno("armv8_switch_to_el1");
#endif
#ifdef CONFIG_ARMV8_SWITCH_TO_EL1 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
if (armv8_switch_to_el1 == -1) {
armv8_switch_to_el1 = 1;
}
#endif
if (armv8_switch_to_el1 == 1) {
armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0, armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
(u64)switch_to_el1, ES_TO_AARCH64); (u64)switch_to_el1, ES_TO_AARCH64);
#else } else {
if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) && if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
(images->os.arch == IH_ARCH_ARM)) (images->os.arch == IH_ARCH_ARM))
armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number, armv8_switch_to_el2(0,
(u64)gd->bd->bi_arch_number,
(u64)images->ft_addr, 0, (u64)images->ft_addr, 0,
(u64)images->ep, (u64)images->ep,
ES_TO_AARCH32); ES_TO_AARCH32);
else else
armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0, armv8_switch_to_el2((u64)images->ft_addr,
0, 0, 0,
images->ep, images->ep,
ES_TO_AARCH64); ES_TO_AARCH64);
#endif }
} }
#else #else
unsigned long machid = gd->bd->bi_arch_number; unsigned long machid = gd->bd->bi_arch_number;