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arm64: rename stext to primary_entry

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For historical reasons, the primary entry routine living somewhere in
the inittext section is called stext(), which is confusing, given that
there is also a section marker called _stext which lives at a fixed
offset in the image (either 64 or 4096 bytes, depending on whether
CONFIG_EFI is enabled)

Let's rename stext to primary_entry(), which is a better description
and reflects the secondary_entry() routine that already exists for
SMP boot.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20200326171423.3080-1-ardb@kernel.org
Reviwed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Ard Biesheuvel 2020-03-26 18:14:23 +01:00 committed by Will Deacon
parent 6a8b55ed40
commit 348a625dee
4 changed files with 13 additions and 14 deletions
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2
arch/arm64/kernel/efi-entry.S
View File

@ -19,7 +19,7 @@ SYM_CODE_START(efi_enter_kernel)
* point stored in x0. Save those values in registers which are
* callee preserved.
*/
ldr w2, =stext_offset
ldr w2, =primary_entry_offset
add x19, x0, x2 // relocated Image entrypoint
mov x20, x1 // DTB address

19
arch/arm64/kernel/head.S
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@ -70,9 +70,9 @@ _head:
* its opcode forms the magic "MZ" signature required by UEFI.
*/
add x13, x18, #0x16
b stext
b primary_entry
#else
b stext // branch to kernel start, magic
b primary_entry // branch to kernel start, magic
.long 0 // reserved
#endif
le64sym _kernel_offset_le // Image load offset from start of RAM, little-endian
@ -98,14 +98,13 @@ pe_header:
* primary lowlevel boot path:
*
* Register Scope Purpose
* x21 stext() .. start_kernel() FDT pointer passed at boot in x0
* x23 stext() .. start_kernel() physical misalignment/KASLR offset
* x28 __create_page_tables() callee preserved temp register
* x19/x20 __primary_switch() callee preserved temp registers
* x24 __primary_switch() .. relocate_kernel()
* current RELR displacement
* x21 primary_entry() .. start_kernel() FDT pointer passed at boot in x0
* x23 primary_entry() .. start_kernel() physical misalignment/KASLR offset
* x28 __create_page_tables() callee preserved temp register
* x19/x20 __primary_switch() callee preserved temp registers
* x24 __primary_switch() .. relocate_kernel() current RELR displacement
*/
SYM_CODE_START(stext)
SYM_CODE_START(primary_entry)
bl preserve_boot_args
bl el2_setup // Drop to EL1, w0=cpu_boot_mode
adrp x23, __PHYS_OFFSET
@ -121,7 +120,7 @@ SYM_CODE_START(stext)
mov x0, #ARM64_CPU_BOOT_PRIMARY
bl __cpu_setup // initialise processor
b __primary_switch
SYM_CODE_END(stext)
SYM_CODE_END(primary_entry)
/*
* Preserve the arguments passed by the bootloader in x0 .. x3

2
arch/arm64/kernel/image-vars.h
View File

@ -13,7 +13,7 @@
#ifdef CONFIG_EFI
__efistub_kernel_size = _edata - _text;
__efistub_stext_offset = stext - _text;
__efistub_primary_entry_offset = primary_entry - _text;
/*

4
arch/arm64/kernel/vmlinux.lds.S
View File

@ -72,8 +72,8 @@ jiffies = jiffies_64;
/*
* The size of the PE/COFF section that covers the kernel image, which
* runs from stext to _edata, must be a round multiple of the PE/COFF
* FileAlignment, which we set to its minimum value of 0x200. 'stext'
* runs from _stext to _edata, must be a round multiple of the PE/COFF
* FileAlignment, which we set to its minimum value of 0x200. '_stext'
* itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
* boundary should be sufficient.
*/