arch/sparc/lib/NGpage.S

Source file repositories/reference/linux-study-clean/arch/sparc/lib/NGpage.S

File Facts

System
Linux kernel
Corpus path
arch/sparc/lib/NGpage.S
Extension
.S
Size
3598 bytes
Lines
139
Domain
Architecture Layer
Bucket
arch/sparc
Inferred role
Architecture Layer: arch/sparc
Status
atlas-only

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

#include <asm/asi.h>
#include <asm/page.h>

	.text
	.align	32

	/* This is heavily simplified from the sun4u variants
	 * because Niagara does not have any D-cache aliasing issues
	 * and also we don't need to use the FPU in order to implement
	 * an optimal page copy/clear.
	 */

NGcopy_user_page:	/* %o0=dest, %o1=src, %o2=vaddr */
	save		%sp, -192, %sp
	rd		%asi, %g3
	wr		%g0, ASI_BLK_INIT_QUAD_LDD_P, %asi
	set		PAGE_SIZE, %g7
	prefetch	[%i1 + 0x00], #one_read
	prefetch	[%i1 + 0x40], #one_read

1:	prefetch	[%i1 + 0x80], #one_read
	prefetch	[%i1 + 0xc0], #one_read
	ldda		[%i1 + 0x00] %asi, %o2
	ldda		[%i1 + 0x10] %asi, %o4
	ldda		[%i1 + 0x20] %asi, %l2
	ldda		[%i1 + 0x30] %asi, %l4
	stxa		%o2, [%i0 + 0x00] %asi
	stxa		%o3, [%i0 + 0x08] %asi
	stxa		%o4, [%i0 + 0x10] %asi
	stxa		%o5, [%i0 + 0x18] %asi
	stxa		%l2, [%i0 + 0x20] %asi
	stxa		%l3, [%i0 + 0x28] %asi
	stxa		%l4, [%i0 + 0x30] %asi
	stxa		%l5, [%i0 + 0x38] %asi
	ldda		[%i1 + 0x40] %asi, %o2
	ldda		[%i1 + 0x50] %asi, %o4
	ldda		[%i1 + 0x60] %asi, %l2
	ldda		[%i1 + 0x70] %asi, %l4
	stxa		%o2, [%i0 + 0x40] %asi
	stxa		%o3, [%i0 + 0x48] %asi
	stxa		%o4, [%i0 + 0x50] %asi
	stxa		%o5, [%i0 + 0x58] %asi
	stxa		%l2, [%i0 + 0x60] %asi
	stxa		%l3, [%i0 + 0x68] %asi
	stxa		%l4, [%i0 + 0x70] %asi
	stxa		%l5, [%i0 + 0x78] %asi
	add		%i1, 128, %i1
	subcc		%g7, 128, %g7
	bne,pt		%xcc, 1b
	 add		%i0, 128, %i0
	wr		%g3, 0x0, %asi
	membar		#Sync
	ret
	 restore

	.align		32
	.globl		NGclear_page
	.globl		NGclear_user_page
NGclear_page:		/* %o0=dest */
NGclear_user_page:	/* %o0=dest, %o1=vaddr */
	rd		%asi, %g3
	wr		%g0, ASI_BLK_INIT_QUAD_LDD_P, %asi
	set		PAGE_SIZE, %g7

1:	stxa		%g0, [%o0 + 0x00] %asi
	stxa		%g0, [%o0 + 0x08] %asi
	stxa		%g0, [%o0 + 0x10] %asi
	stxa		%g0, [%o0 + 0x18] %asi
	stxa		%g0, [%o0 + 0x20] %asi
	stxa		%g0, [%o0 + 0x28] %asi

Annotation

Implementation Notes