arch/x86/um/asm/processor_32.h

Source file repositories/reference/linux-study-clean/arch/x86/um/asm/processor_32.h

File Facts

System
Linux kernel
Corpus path
arch/x86/um/asm/processor_32.h
Extension
.h
Size
1306 bytes
Lines
54
Domain
Architecture Layer
Bucket
arch/x86
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

struct uml_tls_struct {
	struct user_desc tls;
	unsigned flushed:1;
	unsigned present:1;
};

struct arch_thread {
	struct uml_tls_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
	unsigned long debugregs[8];
	int debugregs_seq;
	struct faultinfo faultinfo;
};

#define INIT_ARCH_THREAD { \
	.tls_array  		= { [ 0 ... GDT_ENTRY_TLS_ENTRIES - 1 ] = \
				    { .present = 0, .flushed = 0 } }, \
	.debugregs  		= { [ 0 ... 7 ] = 0 }, \
	.debugregs_seq		= 0, \
	.faultinfo		= { 0, 0, 0 } \
}

#define STACKSLOTS_PER_LINE 8

static inline void arch_flush_thread(struct arch_thread *thread)
{
	/* Clear any TLS still hanging */
	memset(&thread->tls_array, 0, sizeof(thread->tls_array));
}

static inline void arch_copy_thread(struct arch_thread *from,
                                    struct arch_thread *to)
{
        memcpy(&to->tls_array, &from->tls_array, sizeof(from->tls_array));
}

#define current_sp() ({ void *sp; __asm__("movl %%esp, %0" : "=r" (sp) : ); sp; })
#define current_bp() ({ unsigned long bp; __asm__("movl %%ebp, %0" : "=r" (bp) : ); bp; })

#endif

Annotation

Implementation Notes