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| author |   Mark Rutland <mark.rutland@arm.com> | 2020-11-13 12:49:23 +0000 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2020-12-02 19:44:03 +0000 |
| commit | ecbb11ab3ebc02763ec53489c9b1f983be9dc882 (patch) | |
| tree | 84e27abbba48076f30487ea077669d6cf4694f3a /arch/arm64/kernel | |
| parent | arm64: add C wrappers for SET_PSTATE_*() (diff) | |
| download | linux-dev-ecbb11ab3ebc02763ec53489c9b1f983be9dc882.tar.xz linux-dev-ecbb11ab3ebc02763ec53489c9b1f983be9dc882.zip | |
arm64: head.S: rename el2_setup -> init_kernel_el
For a while now el2_setup has performed some basic initialization of EL1
even when the kernel is booted at EL1, so the name is a little
misleading. Further, some comments are stale as with VHE it doesn't drop
the CPU to EL1.
To clarify things, rename el2_setup to init_kernel_el, and update
comments to be clearer as to the function's purpose.
There should be no functional change as a result of this patch.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201113124937.20574-4-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/head.S | 15 | ||||
| -rw-r--r-- | arch/arm64/kernel/sleep.S | 2 |
2 files changed, 9 insertions, 8 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index d8d9caf02834..5a31086e8e85 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -104,7 +104,7 @@ pe_header: */ SYM_CODE_START(primary_entry) bl preserve_boot_args - bl el2_setup // Drop to EL1, w0=cpu_boot_mode + bl init_kernel_el // w0=cpu_boot_mode adrp x23, __PHYS_OFFSET and x23, x23, MIN_KIMG_ALIGN - 1 // KASLR offset, defaults to 0 bl set_cpu_boot_mode_flag @@ -482,13 +482,14 @@ EXPORT_SYMBOL(kimage_vaddr) .section ".idmap.text","awx" /* - * If we're fortunate enough to boot at EL2, ensure that the world is - * sane before dropping to EL1. + * Starting from EL2 or EL1, configure the CPU to execute at the highest + * reachable EL supported by the kernel in a chosen default state. If dropping + * from EL2 to EL1, configure EL2 before configuring EL1. * * Returns either BOOT_CPU_MODE_EL1 or BOOT_CPU_MODE_EL2 in w0 if * booted in EL1 or EL2 respectively. */ -SYM_FUNC_START(el2_setup) +SYM_FUNC_START(init_kernel_el) msr SPsel, #1 // We want to use SP_EL{1,2} mrs x0, CurrentEL cmp x0, #CurrentEL_EL2 @@ -649,7 +650,7 @@ SYM_INNER_LABEL(install_el2_stub, SYM_L_LOCAL) msr elr_el2, lr mov w0, #BOOT_CPU_MODE_EL2 // This CPU booted in EL2 eret -SYM_FUNC_END(el2_setup) +SYM_FUNC_END(init_kernel_el) /* * Sets the __boot_cpu_mode flag depending on the CPU boot mode passed @@ -699,7 +700,7 @@ SYM_DATA_END(__early_cpu_boot_status) * cores are held until we're ready for them to initialise. */ SYM_FUNC_START(secondary_holding_pen) - bl el2_setup // Drop to EL1, w0=cpu_boot_mode + bl init_kernel_el // w0=cpu_boot_mode bl set_cpu_boot_mode_flag mrs x0, mpidr_el1 mov_q x1, MPIDR_HWID_BITMASK @@ -717,7 +718,7 @@ SYM_FUNC_END(secondary_holding_pen) * be used where CPUs are brought online dynamically by the kernel. */ SYM_FUNC_START(secondary_entry) - bl el2_setup // Drop to EL1 + bl init_kernel_el // w0=cpu_boot_mode bl set_cpu_boot_mode_flag b secondary_startup SYM_FUNC_END(secondary_entry) diff --git a/arch/arm64/kernel/sleep.S b/arch/arm64/kernel/sleep.S index ba40d57757d6..4be7f7eed875 100644 --- a/arch/arm64/kernel/sleep.S +++ b/arch/arm64/kernel/sleep.S @@ -99,7 +99,7 @@ SYM_FUNC_END(__cpu_suspend_enter) .pushsection ".idmap.text", "awx" SYM_CODE_START(cpu_resume) - bl el2_setup // if in EL2 drop to EL1 cleanly + bl init_kernel_el bl __cpu_setup /* enable the MMU early - so we can access sleep_save_stash by va */ adrp x1, swapper_pg_dir |