arch/powerpc/include/asm/head-64.h

Source file repositories/reference/linux-study-clean/arch/powerpc/include/asm/head-64.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/head-64.h
Extension
.h
Size
5494 bytes
Lines
173
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_POWERPC_HEAD_64_H
#define _ASM_POWERPC_HEAD_64_H

#include <asm/cache.h>

#ifdef __ASSEMBLER__
/*
 * We can't do CPP stringification and concatination directly into the section
 * name for some reason, so these macros can do it for us.
 */
.macro define_ftsec name
	.section ".head.text.\name\()","ax",@progbits
.endm
.macro define_data_ftsec name
	.section ".head.data.\name\()","a",@progbits
.endm
.macro use_ftsec name
	.section ".head.text.\name\()","ax",@progbits
.endm

/*
 * Fixed (location) sections are used by opening fixed sections and emitting
 * fixed section entries into them before closing them. Multiple fixed sections
 * can be open at any time.
 *
 * Each fixed section created in a .S file must have corresponding linkage
 * directives including location, added to  arch/powerpc/kernel/vmlinux.lds.S
 *
 * For each fixed section, code is generated into it in the order which it
 * appears in the source.  Fixed section entries can be placed at a fixed
 * location within the section using _LOCATION postifx variants. These must
 * be ordered according to their relative placements within the section.
 *
 * OPEN_FIXED_SECTION(section_name, start_address, end_address)
 * FIXED_SECTION_ENTRY_BEGIN(section_name, label1)
 *
 * USE_FIXED_SECTION(section_name)
 * label3:
 *     li  r10,128
 *     mv  r11,r10

 * FIXED_SECTION_ENTRY_BEGIN_LOCATION(section_name, label2, start_address, size)
 * FIXED_SECTION_ENTRY_END_LOCATION(section_name, label2, start_address, size)
 * CLOSE_FIXED_SECTION(section_name)
 *
 * ZERO_FIXED_SECTION can be used to emit zeroed data.
 *
 * Troubleshooting:
 * - If the build dies with "Error: attempt to move .org backwards" at
 *   CLOSE_FIXED_SECTION() or elsewhere, there may be something
 *   unexpected being added there. Remove the '. = x_len' line, rebuild, and
 *   check what is pushing the section down.
 * - If the build dies in linking, check arch/powerpc/tools/head_check.sh
 *   comments.
 * - If the kernel crashes or hangs in very early boot, it could be linker
 *   stubs at the start of the main text.
 */

#define OPEN_FIXED_SECTION(sname, start, end)			\
	sname##_start = (start);				\
	sname##_end = (end);					\
	sname##_len = (end) - (start);				\
	define_ftsec sname;					\
	. = 0x0;						\
start_##sname:

/*
 * .linker_stub_catch section is used to catch linker stubs from being
 * inserted in our .text section, above the start_text label (which breaks
 * the ABS_ADDR calculation). See kernel/vmlinux.lds.S and tools/head_check.sh
 * for more details. We would prefer to just keep a cacheline (0x80), but
 * 0x100 seems to be how the linker aligns branch stub groups.
 */
#ifdef CONFIG_LD_HEAD_STUB_CATCH
#define OPEN_TEXT_SECTION(start)				\
	.section ".linker_stub_catch","ax",@progbits;		\
linker_stub_catch:						\
	. = 0x4;						\
	text_start = (start) + 0x100;				\
	.section ".text","ax",@progbits;			\
	.balign 0x100;						\
start_text:
#else
#define OPEN_TEXT_SECTION(start)				\
	text_start = (start);					\
	.section ".text","ax",@progbits;			\
	. = 0x0;						\
start_text:
#endif

Annotation

Implementation Notes