arch/hexagon/mm/init.c

File Facts

System

Linux kernel

Corpus path

arch/hexagon/mm/init.c

Extension

.c

Size

7545 bytes

Lines

245

Domain

Architecture Layer

Bucket

arch/hexagon

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/init.h
• linux/mm.h
• linux/memblock.h
• asm/atomic.h
• linux/highmem.h
• asm/tlb.h
• asm/sections.h
• asm/setup.h
• asm/vm_mmu.h

Detected Declarations

• function sync_icache_dcache
• function arch_zone_limits_init
• function paging_init
• function early_mem
• function setup_arch_memory

Annotated Snippet

*  which is called by start_kernel() later on in the process
	 */
}

static const pgprot_t protection_map[16] = {
	[VM_NONE]					= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   CACHEDEF),
	[VM_READ]					= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_READ | CACHEDEF),
	[VM_WRITE]					= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   CACHEDEF),
	[VM_WRITE | VM_READ]				= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_READ | CACHEDEF),
	[VM_EXEC]					= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_EXECUTE | CACHEDEF),
	[VM_EXEC | VM_READ]				= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_EXECUTE | _PAGE_READ |
								   CACHEDEF),
	[VM_EXEC | VM_WRITE]				= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_EXECUTE | CACHEDEF),
	[VM_EXEC | VM_WRITE | VM_READ]			= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_EXECUTE | _PAGE_READ |
								   CACHEDEF),
	[VM_SHARED]                                     = __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   CACHEDEF),
	[VM_SHARED | VM_READ]				= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_READ | CACHEDEF),
	[VM_SHARED | VM_WRITE]				= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_WRITE | CACHEDEF),
	[VM_SHARED | VM_WRITE | VM_READ]		= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_READ | _PAGE_WRITE |
								   CACHEDEF),
	[VM_SHARED | VM_EXEC]				= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_EXECUTE | CACHEDEF),
	[VM_SHARED | VM_EXEC | VM_READ]			= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_EXECUTE | _PAGE_READ |
								   CACHEDEF),
	[VM_SHARED | VM_EXEC | VM_WRITE]		= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_EXECUTE | _PAGE_WRITE |
								   CACHEDEF),
	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= __pgprot(_PAGE_PRESENT | _PAGE_USER |
								   _PAGE_READ | _PAGE_EXECUTE |
								   _PAGE_WRITE | CACHEDEF)
};
DECLARE_VM_GET_PAGE_PROT

Annotation

• Immediate include surface: `linux/init.h`, `linux/mm.h`, `linux/memblock.h`, `asm/atomic.h`, `linux/highmem.h`, `asm/tlb.h`, `asm/sections.h`, `asm/setup.h`.
• Detected declarations: `function sync_icache_dcache`, `function arch_zone_limits_init`, `function paging_init`, `function early_mem`, `function setup_arch_memory`.
• Atlas domain: Architecture Layer / arch/hexagon.
• 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.