Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 256 insertions, 0 deletions

diff --git a/arch/sparc/mm/swift.S b/arch/sparc/mm/swift.S
new file mode 100644
index 000000000..f414bfd8d
--- /dev/null
+++ b/arch/sparc/mm/swift.S
@@ -0,0 +1,256 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * swift.S: MicroSparc-II mmu/cache operations.
+ *
+ * Copyright (C) 1999 David S. Miller (davem@redhat.com)
+ */
+
+#include <asm/psr.h>
+#include <asm/asi.h>
+#include <asm/page.h>
+#include <asm/pgtsrmmu.h>
+#include <asm/asm-offsets.h>
+
+	.text
+	.align	4
+
+#if 1	/* XXX screw this, I can't get the VAC flushes working
+	 * XXX reliably... -DaveM
+	 */
+	.globl	swift_flush_cache_all, swift_flush_cache_mm
+	.globl	swift_flush_cache_range, swift_flush_cache_page
+	.globl	swift_flush_page_for_dma
+	.globl	swift_flush_page_to_ram
+
+swift_flush_cache_all:
+swift_flush_cache_mm:
+swift_flush_cache_range:
+swift_flush_cache_page:
+swift_flush_page_for_dma:
+swift_flush_page_to_ram:
+	sethi	%hi(0x2000), %o0
+1:	subcc	%o0, 0x10, %o0
+	add	%o0, %o0, %o1
+	sta	%g0, [%o0] ASI_M_DATAC_TAG
+	bne	1b
+	 sta	%g0, [%o1] ASI_M_TXTC_TAG
+	retl
+	 nop
+#else
+
+	.globl	swift_flush_cache_all
+swift_flush_cache_all:
+	WINDOW_FLUSH(%g4, %g5)
+
+	/* Just clear out all the tags. */
+	sethi	%hi(16 * 1024), %o0
+1:	subcc	%o0, 16, %o0
+	sta	%g0, [%o0] ASI_M_TXTC_TAG
+	bne	1b
+	 sta	%g0, [%o0] ASI_M_DATAC_TAG
+	retl
+	 nop
+
+	.globl	swift_flush_cache_mm
+swift_flush_cache_mm:
+	ld	[%o0 + AOFF_mm_context], %g2
+	cmp	%g2, -1
+	be	swift_flush_cache_mm_out
+	WINDOW_FLUSH(%g4, %g5)
+	rd	%psr, %g1
+	andn	%g1, PSR_ET, %g3
+	wr	%g3, 0x0, %psr
+	nop
+	nop
+	mov	SRMMU_CTX_REG, %g7
+	lda	[%g7] ASI_M_MMUREGS, %g5
+	sta	%g2, [%g7] ASI_M_MMUREGS
+
+#if 1
+	sethi	%hi(0x2000), %o0
+1:	subcc	%o0, 0x10, %o0
+	sta	%g0, [%o0] ASI_M_FLUSH_CTX
+	bne	1b
+	 nop
+#else
+	clr	%o0
+	or	%g0, 2048, %g7
+	or	%g0, 2048, %o1
+	add	%o1, 2048, %o2
+	add	%o2, 2048, %o3
+	mov	16, %o4
+	add	%o4, 2048, %o5
+	add	%o5, 2048, %g2
+	add	%g2, 2048, %g3
+1:	sta	%g0, [%o0      ] ASI_M_FLUSH_CTX
+	sta	%g0, [%o0 + %o1] ASI_M_FLUSH_CTX
+	sta	%g0, [%o0 + %o2] ASI_M_FLUSH_CTX
+	sta	%g0, [%o0 + %o3] ASI_M_FLUSH_CTX
+	sta	%g0, [%o0 + %o4] ASI_M_FLUSH_CTX
+	sta	%g0, [%o0 + %o5] ASI_M_FLUSH_CTX
+	sta	%g0, [%o0 + %g2] ASI_M_FLUSH_CTX
+	sta	%g0, [%o0 + %g3] ASI_M_FLUSH_CTX
+	subcc	%g7, 32, %g7
+	bne	1b
+	 add	%o0, 32, %o0
+#endif
+
+	mov	SRMMU_CTX_REG, %g7
+	sta	%g5, [%g7] ASI_M_MMUREGS
+	wr	%g1, 0x0, %psr
+	nop
+	nop
+swift_flush_cache_mm_out:
+	retl
+	 nop
+
+	.globl	swift_flush_cache_range
+swift_flush_cache_range:
+	ld	[%o0 + VMA_VM_MM], %o0
+	sub	%o2, %o1, %o2
+	sethi	%hi(4096), %o3
+	cmp	%o2, %o3
+	bgu	swift_flush_cache_mm
+	 nop
+	b	70f
+	 nop
+
+	.globl	swift_flush_cache_page
+swift_flush_cache_page:
+	ld	[%o0 + VMA_VM_MM], %o0
+70:
+	ld	[%o0 + AOFF_mm_context], %g2
+	cmp	%g2, -1
+	be	swift_flush_cache_page_out
+	WINDOW_FLUSH(%g4, %g5)
+	rd	%psr, %g1
+	andn	%g1, PSR_ET, %g3
+	wr	%g3, 0x0, %psr
+	nop
+	nop
+	mov	SRMMU_CTX_REG, %g7
+	lda	[%g7] ASI_M_MMUREGS, %g5
+	sta	%g2, [%g7] ASI_M_MMUREGS
+
+	andn	%o1, (PAGE_SIZE - 1), %o1
+#if 1
+	sethi	%hi(0x1000), %o0
+1:	subcc	%o0, 0x10, %o0
+	sta	%g0, [%o1 + %o0] ASI_M_FLUSH_PAGE
+	bne	1b
+	 nop
+#else
+	or	%g0, 512, %g7
+	or	%g0, 512, %o0
+	add	%o0, 512, %o2
+	add	%o2, 512, %o3
+	add	%o3, 512, %o4
+	add	%o4, 512, %o5
+	add	%o5, 512, %g3
+	add	%g3, 512, %g4
+1:	sta	%g0, [%o1      ] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %o0] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %o2] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %o3] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %o4] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %o5] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %g3] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %g4] ASI_M_FLUSH_PAGE
+	subcc	%g7, 16, %g7
+	bne	1b
+	 add	%o1, 16, %o1
+#endif
+
+	mov	SRMMU_CTX_REG, %g7
+	sta	%g5, [%g7] ASI_M_MMUREGS
+	wr	%g1, 0x0, %psr
+	nop
+	nop
+swift_flush_cache_page_out:
+	retl
+	 nop
+
+	/* Swift is write-thru, however it is not
+	 * I/O nor TLB-walk coherent.  Also it has
+	 * caches which are virtually indexed and tagged.
+	 */
+	.globl	swift_flush_page_for_dma
+	.globl	swift_flush_page_to_ram
+swift_flush_page_for_dma:
+swift_flush_page_to_ram:
+	andn	%o0, (PAGE_SIZE - 1), %o1
+#if 1
+	sethi	%hi(0x1000), %o0
+1:	subcc	%o0, 0x10, %o0
+	sta	%g0, [%o1 + %o0] ASI_M_FLUSH_PAGE
+	bne	1b
+	 nop
+#else
+	or	%g0, 512, %g7
+	or	%g0, 512, %o0
+	add	%o0, 512, %o2
+	add	%o2, 512, %o3
+	add	%o3, 512, %o4
+	add	%o4, 512, %o5
+	add	%o5, 512, %g3
+	add	%g3, 512, %g4
+1:	sta	%g0, [%o1      ] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %o0] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %o2] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %o3] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %o4] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %o5] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %g3] ASI_M_FLUSH_PAGE
+	sta	%g0, [%o1 + %g4] ASI_M_FLUSH_PAGE
+	subcc	%g7, 16, %g7
+	bne	1b
+	 add	%o1, 16, %o1
+#endif
+	retl
+	 nop
+#endif
+
+	.globl	swift_flush_sig_insns
+swift_flush_sig_insns:
+	flush	%o1
+	retl
+	 flush	%o1 + 4
+
+	.globl	swift_flush_tlb_mm
+	.globl	swift_flush_tlb_range
+	.globl	swift_flush_tlb_all
+swift_flush_tlb_range:
+	ld	[%o0 + VMA_VM_MM], %o0
+swift_flush_tlb_mm:
+	ld	[%o0 + AOFF_mm_context], %g2
+	cmp	%g2, -1
+	be	swift_flush_tlb_all_out
+swift_flush_tlb_all:
+	mov	0x400, %o1
+	sta	%g0, [%o1] ASI_M_FLUSH_PROBE
+swift_flush_tlb_all_out:
+	retl
+	 nop
+
+	.globl	swift_flush_tlb_page
+swift_flush_tlb_page:
+	ld	[%o0 + VMA_VM_MM], %o0
+	mov	SRMMU_CTX_REG, %g1
+	ld	[%o0 + AOFF_mm_context], %o3
+	andn	%o1, (PAGE_SIZE - 1), %o1
+	cmp	%o3, -1
+	be	swift_flush_tlb_page_out
+	 nop
+#if 1
+	mov	0x400, %o1
+	sta	%g0, [%o1] ASI_M_FLUSH_PROBE	
+#else
+	lda	[%g1] ASI_M_MMUREGS, %g5
+	sta	%o3, [%g1] ASI_M_MMUREGS
+	sta	%g0, [%o1] ASI_M_FLUSH_PAGE	/* rem. virt. cache. prot. */
+	sta	%g0, [%o1] ASI_M_FLUSH_PROBE
+	sta	%g5, [%g1] ASI_M_MMUREGS
+#endif
+swift_flush_tlb_page_out:
+	retl
+	 nop