arch/loongarch/mm/cache.c

Source file repositories/reference/linux-study-clean/arch/loongarch/mm/cache.c

File Facts

System: Linux kernel
Corpus path: arch/loongarch/mm/cache.c
Extension: .c
Size: 5841 bytes
Lines: 196
Domain: Architecture Layer
Bucket: arch/loongarch
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/cacheinfo.h
linux/export.h
linux/fs.h
linux/highmem.h
linux/kernel.h
linux/linkage.h
linux/mm.h
linux/sched.h
linux/syscalls.h
asm/bootinfo.h
asm/cacheflush.h
asm/cpu.h
asm/cpu-features.h
asm/loongarch.h
asm/numa.h
asm/processor.h
asm/setup.h

Detected Declarations

function Copyright
function flush_cache_leaf
function __flush_cache_all
function cpu_cache_init

Annotated Snippet

if (config & LXIUPRE) {
			if (config & LXIUUNIFY)
				cdesc->type = CACHE_TYPE_UNIFIED;
			else
				cdesc->type = CACHE_TYPE_INST;
			populate_cache_properties(config, cdesc, level, leaf);
		}

		if (config & LXDPRE) {
			cdesc->type = CACHE_TYPE_DATA;
			populate_cache_properties(config, cdesc, level, leaf);
		}

		config = config >> 7;
	}

	BUG_ON(leaf > CACHE_LEAVES_MAX);

	current_cpu_data.cache_leaves_present = leaf;
	current_cpu_data.options |= LOONGARCH_CPU_PREFETCH;
}

static const pgprot_t protection_map[16] = {
	[VM_NONE]					= __pgprot(_CACHE_CC | _PAGE_USER |
								   _PAGE_NO_EXEC | _PAGE_NO_READ |
								   (_PAGE_PROTNONE ? : _PAGE_PRESENT)),
	[VM_READ]					= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT |
								   _PAGE_NO_EXEC),
	[VM_WRITE]					= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT |
								   _PAGE_NO_EXEC),
	[VM_WRITE | VM_READ]				= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT |
								   _PAGE_NO_EXEC),
	[VM_EXEC]					= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT),
	[VM_EXEC | VM_READ]				= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT),
	[VM_EXEC | VM_WRITE]				= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT),
	[VM_EXEC | VM_WRITE | VM_READ]			= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT),
	[VM_SHARED]					= __pgprot(_CACHE_CC | _PAGE_USER |
								   _PAGE_NO_EXEC | _PAGE_NO_READ |
								   (_PAGE_PROTNONE ? : _PAGE_PRESENT)),
	[VM_SHARED | VM_READ]				= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT |
								   _PAGE_NO_EXEC),
	[VM_SHARED | VM_WRITE]				= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT |
								   _PAGE_NO_EXEC | _PAGE_WRITE),
	[VM_SHARED | VM_WRITE | VM_READ]		= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT |
								   _PAGE_NO_EXEC | _PAGE_WRITE),
	[VM_SHARED | VM_EXEC]				= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT),
	[VM_SHARED | VM_EXEC | VM_READ]			= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT),
	[VM_SHARED | VM_EXEC | VM_WRITE]		= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT |
								   _PAGE_WRITE),
	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= __pgprot(_CACHE_CC | _PAGE_VALID |
								   _PAGE_USER | _PAGE_PRESENT |
								   _PAGE_WRITE)
};
DECLARE_VM_GET_PAGE_PROT

Annotation

Immediate include surface: `linux/cacheinfo.h`, `linux/export.h`, `linux/fs.h`, `linux/highmem.h`, `linux/kernel.h`, `linux/linkage.h`, `linux/mm.h`, `linux/sched.h`.
Detected declarations: `function Copyright`, `function flush_cache_leaf`, `function __flush_cache_all`, `function cpu_cache_init`.
Atlas domain: Architecture Layer / arch/loongarch.
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.