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-rw-r--r--arch/sparc/mm/swift.S256
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diff --git a/arch/sparc/mm/swift.S b/arch/sparc/mm/swift.S
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+/* 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