In subsequent patches we'll use a transient pgd during the primary cpu's
boot process. To make this work while allowing secondary cpus to use the
swapper_pg_dir, we need to pass the relevant TTBR1 pgd as a parameter
to __enable_mmu().
This patch updates __enable__mmu() to take this as a parameter, updating
callsites to pass swapper_pg_dir for now.
There should be no functional change as a result of this patch.
Signed-off-by: Jun Yao <yaojun8558363@gmail.com>
Reviewed-by: James Morse <james.morse@arm.com>
[Mark: simplify assembly, clarify commit message]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
* Common entry point for secondary CPUs.
*/
bl __cpu_setup // initialise processor
* Common entry point for secondary CPUs.
*/
bl __cpu_setup // initialise processor
+ adrp x1, swapper_pg_dir
bl __enable_mmu
ldr x8, =__secondary_switched
br x8
bl __enable_mmu
ldr x8, =__secondary_switched
br x8
* Enable the MMU.
*
* x0 = SCTLR_EL1 value for turning on the MMU.
* Enable the MMU.
*
* x0 = SCTLR_EL1 value for turning on the MMU.
*
* Returns to the caller via x30/lr. This requires the caller to be covered
* by the .idmap.text section.
*
* Returns to the caller via x30/lr. This requires the caller to be covered
* by the .idmap.text section.
* If it isn't, park the CPU
*/
ENTRY(__enable_mmu)
* If it isn't, park the CPU
*/
ENTRY(__enable_mmu)
- mrs x1, ID_AA64MMFR0_EL1
- ubfx x2, x1, #ID_AA64MMFR0_TGRAN_SHIFT, 4
+ mrs x2, ID_AA64MMFR0_EL1
+ ubfx x2, x2, #ID_AA64MMFR0_TGRAN_SHIFT, 4
cmp x2, #ID_AA64MMFR0_TGRAN_SUPPORTED
b.ne __no_granule_support
cmp x2, #ID_AA64MMFR0_TGRAN_SUPPORTED
b.ne __no_granule_support
- update_early_cpu_boot_status 0, x1, x2
- adrp x1, idmap_pg_dir
- adrp x2, swapper_pg_dir
- phys_to_ttbr x3, x1
- phys_to_ttbr x4, x2
- msr ttbr0_el1, x3 // load TTBR0
- msr ttbr1_el1, x4 // load TTBR1
+ update_early_cpu_boot_status 0, x2, x3
+ adrp x2, idmap_pg_dir
+ phys_to_ttbr x1, x1
+ phys_to_ttbr x2, x2
+ msr ttbr0_el1, x2 // load TTBR0
+ msr ttbr1_el1, x1 // load TTBR1
isb
msr sctlr_el1, x0
isb
isb
msr sctlr_el1, x0
isb
mrs x20, sctlr_el1 // preserve old SCTLR_EL1 value
#endif
mrs x20, sctlr_el1 // preserve old SCTLR_EL1 value
#endif
+ adrp x1, swapper_pg_dir
bl __enable_mmu
#ifdef CONFIG_RELOCATABLE
bl __relocate_kernel
bl __enable_mmu
#ifdef CONFIG_RELOCATABLE
bl __relocate_kernel
bl el2_setup // if in EL2 drop to EL1 cleanly
bl __cpu_setup
/* enable the MMU early - so we can access sleep_save_stash by va */
bl el2_setup // if in EL2 drop to EL1 cleanly
bl __cpu_setup
/* enable the MMU early - so we can access sleep_save_stash by va */
+ adrp x1, swapper_pg_dir
bl __enable_mmu
ldr x8, =_cpu_resume
br x8
bl __enable_mmu
ldr x8, =_cpu_resume
br x8