patch-1.3.71 linux/arch/sparc/mm/s4ckflt.S

• Lines: 106
• Date: Mon Mar 4 08:49:58 1996
• Orig file: v1.3.70/linux/arch/sparc/mm/s4ckflt.S
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.70/linux/arch/sparc/mm/s4ckflt.S linux/arch/sparc/mm/s4ckflt.S
@@ -0,0 +1,105 @@
+/* s4ckflt.S:  Quick in window kernel faults on the sun4c.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caipfs.rutgers.edu)
+ */
+
+#include "s4clow.h"
+
+	.text
+	.align 8
+	.globl	sun4c_quick_kernel_fault
+sun4c_quick_kernel_fault:
+	sethi	%hi(REAL_PGDIR_MASK), %l5
+	and	%l7, %l5, %l7
+	sethi	%hi(C_LABEL(invalid_segment)), %l5
+	lduba	[%l7] 0x3, %l4
+	ld	[%l5 + %lo(C_LABEL(invalid_segment))], %l5
+	cmp	%l4, %l5
+	bne	segment_loaded
+	 nop
+
+	/* We need some breathing room to pull this off, save
+	 * away some globals.
+	 */
+	std	%g0, [REGSAVE_BASE + KFLTREGS + 0x00]
+	std	%g2, [REGSAVE_BASE + KFLTREGS + 0x08]
+	std	%g4, [REGSAVE_BASE + KFLTREGS + 0x10]
+	std	%g6, [REGSAVE_BASE + KFLTREGS + 0x18]
+	std	%l0, [REGSAVE_BASE + KFLTREGS + 0x20]
+	std	%l2, [REGSAVE_BASE + KFLTREGS + 0x28]
+
+	set	C_LABEL(sun4c_kfree_ring), %g1
+	ld	[%g1 + RING_NENTRIES], %g2
+	cmp	%g2, 0x0
+	be,a	pseg_steal
+	 nop
+
+	b	distribute_segmap
+	 ld	[%g1 + RING_RINGHD + MMU_ENTRY_NEXT], %g2
+
+pseg_steal:
+	/* This is the hard case. */	
+	set	C_LABEL(sun4c_kernel_ring), %g1
+	ld	[%g1 + RING_RINGHD + MMU_ENTRY_PREV], %g2
+	b	kernel_segment_cache_flush
+	 ld	[%g2 + MMU_ENTRY_VADDR], %l0
+
+pseg_steal_after_flush:
+	ld	[%g2 + MMU_ENTRY_VADDR], %l0
+	sethi	%hi(0x30000000), %l1
+	lduba	[%l1] 0x02, %g7
+	sethi	%hi(C_LABEL(num_contexts)), %g6
+	mov	0, %g5
+	ld	[%g6 + %lo(C_LABEL(num_contexts))], %g6
+1:
+	stba	%g5, [%l1] 0x02
+	add	%g5, 1, %g5
+	cmp	%g5, %g6
+	bl	1b
+	 stba	%l5, [%l0] 0x03
+
+	stba	%g7, [%l1] 0x02
+
+	
+
+distribute_segmap:
+	st	%l7, [%g2 + MMU_ENTRY_VADDR]
+	ldub	[%g2 + MMU_ENTRY_PSEG], %g3
+	sethi	%hi(0x30000000), %l0
+	lduba	[%l0] 0x02, %g7
+	sethi	%hi(C_LABEL(num_contexts)), %g6
+	mov	0, %g5
+	ld	[%g6 + %lo(C_LABEL(num_contexts))], %g6
+1:
+	stba	%g5, [%l0] 0x02
+	add	%g5, 1, %g5
+	cmp	%g5, %g6
+	bl	1b
+	 stba	%g3, [%l7] 0x03
+
+	stba	%g7, [%l0] 0x02
+
+segment_loaded:
+	sethi	%hi(VMALLOC_START), %l4
+	cmp	%l7, %l4
+	bge	vmalloc_kernel_fault
+	 nop
+
+
+
+
+
+vmalloc_kernel_fault:
+
+
+qkf_exit:
+	/* Fault serviced, return from trap, but reload
+	 * registers first.
+	 */
+	ldd	[REGSAVE_BASE + KFLTREGS + 0x00], %g0
+	ldd	[REGSAVE_BASE + KFLTREGS + 0x08], %g2
+	ldd	[REGSAVE_BASE + KFLTREGS + 0x10], %g4
+	ldd	[REGSAVE_BASE + KFLTREGS + 0x18], %g6
+	ldd	[REGSAVE_BASE + KFLTREGS + 0x20], %l0
+	ldd	[REGSAVE_BASE + KFLTREGS + 0x28], %l2
+