arch/powerpc/include/asm/task_size_32.h

File Facts

System

Linux kernel

Corpus path

arch/powerpc/include/asm/task_size_32.h

Extension

.h

Size

1345 bytes

Lines

48

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.

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

Dependency Surface

• linux/sizes.h

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#ifndef _ASM_POWERPC_TASK_SIZE_32_H
#define _ASM_POWERPC_TASK_SIZE_32_H

#include <linux/sizes.h>

#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
#error User TASK_SIZE overlaps with KERNEL_START address
#endif

#ifdef CONFIG_PPC_8xx
#define MODULES_END	ASM_CONST(CONFIG_PAGE_OFFSET)
#define MODULES_SIZE	(CONFIG_MODULES_SIZE * SZ_1M)
#define MODULES_VADDR	(MODULES_END - MODULES_SIZE)
#define MODULES_BASE	(MODULES_VADDR & ~(UL(SZ_4M) - 1))
#define USER_TOP	(MODULES_BASE - SZ_4M)
#endif

#ifdef CONFIG_PPC_BOOK3S_32
#define MODULES_END	(ASM_CONST(CONFIG_PAGE_OFFSET) & ~(UL(SZ_256M) - 1))
#define MODULES_SIZE	(CONFIG_MODULES_SIZE * SZ_1M)
#define MODULES_VADDR	(MODULES_END - MODULES_SIZE)
#define MODULES_BASE	(MODULES_VADDR & ~(UL(SZ_256M) - 1))
#define USER_TOP	(MODULES_BASE - SZ_4M)
#endif

#ifndef USER_TOP
#define USER_TOP	((ASM_CONST(CONFIG_PAGE_OFFSET) - SZ_128K) & ~(UL(SZ_128K) - 1))
#endif

#if CONFIG_TASK_SIZE < USER_TOP
#define TASK_SIZE ASM_CONST(CONFIG_TASK_SIZE)
#else
#define TASK_SIZE USER_TOP
#endif

/*
 * This decides where the kernel will search for a free chunk of vm space during
 * mmap's.
 */
#define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)

#define DEFAULT_MAP_WINDOW TASK_SIZE
#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX STACK_TOP

#endif /* _ASM_POWERPC_TASK_SIZE_32_H */

Annotation

• Immediate include surface: `linux/sizes.h`.
• Atlas domain: Architecture Layer / arch/powerpc.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.