diff options
Diffstat (limited to 'arch/xtensa/mm/misc.S')
| -rw-r--r-- | arch/xtensa/mm/misc.S | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/arch/xtensa/mm/misc.S b/arch/xtensa/mm/misc.S new file mode 100644 index 0000000000000..327c0f17187c0 --- /dev/null +++ b/arch/xtensa/mm/misc.S @@ -0,0 +1,374 @@ +/* + * arch/xtensa/mm/misc.S + * + * Miscellaneous assembly functions. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2001 - 2005 Tensilica Inc. + * + * Chris Zankel <chris@zankel.net> + */ + +/* Note: we might want to implement some of the loops as zero-overhead-loops, + * where applicable and if supported by the processor. + */ + +#include <linux/linkage.h> +#include <asm/page.h> +#include <asm/pgtable.h> + +#include <xtensa/cacheasm.h> +#include <xtensa/cacheattrasm.h> + +/* clear_page (page) */ + +ENTRY(clear_page) + entry a1, 16 + addi a4, a2, PAGE_SIZE + movi a3, 0 + +1: s32i a3, a2, 0 + s32i a3, a2, 4 + s32i a3, a2, 8 + s32i a3, a2, 12 + s32i a3, a2, 16 + s32i a3, a2, 20 + s32i a3, a2, 24 + s32i a3, a2, 28 + addi a2, a2, 32 + blt a2, a4, 1b + + retw + +/* + * copy_page (void *to, void *from) + * a2 a3 + */ + +ENTRY(copy_page) + entry a1, 16 + addi a4, a2, PAGE_SIZE + +1: l32i a5, a3, 0 + l32i a6, a3, 4 + l32i a7, a3, 8 + s32i a5, a2, 0 + s32i a6, a2, 4 + s32i a7, a2, 8 + l32i a5, a3, 12 + l32i a6, a3, 16 + l32i a7, a3, 20 + s32i a5, a2, 12 + s32i a6, a2, 16 + s32i a7, a2, 20 + l32i a5, a3, 24 + l32i a6, a3, 28 + s32i a5, a2, 24 + s32i a6, a2, 28 + addi a2, a2, 32 + addi a3, a3, 32 + blt a2, a4, 1b + + retw + + +/* + * void __flush_invalidate_cache_all(void) + */ + +ENTRY(__flush_invalidate_cache_all) + entry sp, 16 + dcache_writeback_inv_all a2, a3 + icache_invalidate_all a2, a3 + retw + +/* + * void __invalidate_icache_all(void) + */ + +ENTRY(__invalidate_icache_all) + entry sp, 16 + icache_invalidate_all a2, a3 + retw + +/* + * void __flush_invalidate_dcache_all(void) + */ + +ENTRY(__flush_invalidate_dcache_all) + entry sp, 16 + dcache_writeback_inv_all a2, a3 + retw + + +/* + * void __flush_invalidate_cache_range(ulong start, ulong size) + */ + +ENTRY(__flush_invalidate_cache_range) + entry sp, 16 + mov a4, a2 + mov a5, a3 + dcache_writeback_inv_region a4, a5, a6 + icache_invalidate_region a2, a3, a4 + retw + +/* + * void __invalidate_icache_page(ulong start) + */ + +ENTRY(__invalidate_icache_page) + entry sp, 16 + movi a3, PAGE_SIZE + icache_invalidate_region a2, a3, a4 + retw + +/* + * void __invalidate_dcache_page(ulong start) + */ + +ENTRY(__invalidate_dcache_page) + entry sp, 16 + movi a3, PAGE_SIZE + dcache_invalidate_region a2, a3, a4 + retw + +/* + * void __invalidate_icache_range(ulong start, ulong size) + */ + +ENTRY(__invalidate_icache_range) + entry sp, 16 + icache_invalidate_region a2, a3, a4 + retw + +/* + * void __invalidate_dcache_range(ulong start, ulong size) + */ + +ENTRY(__invalidate_dcache_range) + entry sp, 16 + dcache_invalidate_region a2, a3, a4 + retw + +/* + * void __flush_dcache_page(ulong start) + */ + +ENTRY(__flush_dcache_page) + entry sp, 16 + movi a3, PAGE_SIZE + dcache_writeback_region a2, a3, a4 + retw + +/* + * void __flush_invalidate_dcache_page(ulong start) + */ + +ENTRY(__flush_invalidate_dcache_page) + entry sp, 16 + movi a3, PAGE_SIZE + dcache_writeback_inv_region a2, a3, a4 + retw + +/* + * void __flush_invalidate_dcache_range(ulong start, ulong size) + */ + +ENTRY(__flush_invalidate_dcache_range) + entry sp, 16 + dcache_writeback_inv_region a2, a3, a4 + retw + +/* + * void __invalidate_dcache_all(void) + */ + +ENTRY(__invalidate_dcache_all) + entry sp, 16 + dcache_invalidate_all a2, a3 + retw + +/* + * void __flush_invalidate_dcache_page_phys(ulong start) + */ + +ENTRY(__flush_invalidate_dcache_page_phys) + entry sp, 16 + + movi a3, XCHAL_DCACHE_SIZE + movi a4, PAGE_MASK | 1 + addi a2, a2, 1 + +1: addi a3, a3, -XCHAL_DCACHE_LINESIZE + + ldct a6, a3 + dsync + and a6, a6, a4 + beq a6, a2, 2f + bgeui a3, 2, 1b + retw + +2: diwbi a3, 0 + bgeui a3, 2, 1b + retw + +ENTRY(check_dcache_low0) + entry sp, 16 + + movi a3, XCHAL_DCACHE_SIZE / 4 + movi a4, PAGE_MASK | 1 + addi a2, a2, 1 + +1: addi a3, a3, -XCHAL_DCACHE_LINESIZE + + ldct a6, a3 + dsync + and a6, a6, a4 + beq a6, a2, 2f + bgeui a3, 2, 1b + retw + +2: j 2b + +ENTRY(check_dcache_high0) + entry sp, 16 + + movi a5, XCHAL_DCACHE_SIZE / 4 + movi a3, XCHAL_DCACHE_SIZE / 2 + movi a4, PAGE_MASK | 1 + addi a2, a2, 1 + +1: addi a3, a3, -XCHAL_DCACHE_LINESIZE + addi a5, a5, -XCHAL_DCACHE_LINESIZE + + ldct a6, a3 + dsync + and a6, a6, a4 + beq a6, a2, 2f + bgeui a5, 2, 1b + retw + +2: j 2b + +ENTRY(check_dcache_low1) + entry sp, 16 + + movi a5, XCHAL_DCACHE_SIZE / 4 + movi a3, XCHAL_DCACHE_SIZE * 3 / 4 + movi a4, PAGE_MASK | 1 + addi a2, a2, 1 + +1: addi a3, a3, -XCHAL_DCACHE_LINESIZE + addi a5, a5, -XCHAL_DCACHE_LINESIZE + + ldct a6, a3 + dsync + and a6, a6, a4 + beq a6, a2, 2f + bgeui a5, 2, 1b + retw + +2: j 2b + +ENTRY(check_dcache_high1) + entry sp, 16 + + movi a5, XCHAL_DCACHE_SIZE / 4 + movi a3, XCHAL_DCACHE_SIZE + movi a4, PAGE_MASK | 1 + addi a2, a2, 1 + +1: addi a3, a3, -XCHAL_DCACHE_LINESIZE + addi a5, a5, -XCHAL_DCACHE_LINESIZE + + ldct a6, a3 + dsync + and a6, a6, a4 + beq a6, a2, 2f + bgeui a5, 2, 1b + retw + +2: j 2b + + +/* + * void __invalidate_icache_page_phys(ulong start) + */ + +ENTRY(__invalidate_icache_page_phys) + entry sp, 16 + + movi a3, XCHAL_ICACHE_SIZE + movi a4, PAGE_MASK | 1 + addi a2, a2, 1 + +1: addi a3, a3, -XCHAL_ICACHE_LINESIZE + + lict a6, a3 + isync + and a6, a6, a4 + beq a6, a2, 2f + bgeui a3, 2, 1b + retw + +2: iii a3, 0 + bgeui a3, 2, 1b + retw + + +#if 0 + + movi a3, XCHAL_DCACHE_WAYS - 1 + movi a4, PAGE_SIZE + +1: mov a5, a2 + add a6, a2, a4 + +2: diwbi a5, 0 + diwbi a5, XCHAL_DCACHE_LINESIZE + diwbi a5, XCHAL_DCACHE_LINESIZE * 2 + diwbi a5, XCHAL_DCACHE_LINESIZE * 3 + + addi a5, a5, XCHAL_DCACHE_LINESIZE * 4 + blt a5, a6, 2b + + addi a3, a3, -1 + addi a2, a2, XCHAL_DCACHE_SIZE / XCHAL_DCACHE_WAYS + bgez a3, 1b + + retw + +ENTRY(__invalidate_icache_page_index) + entry sp, 16 + + movi a3, XCHAL_ICACHE_WAYS - 1 + movi a4, PAGE_SIZE + +1: mov a5, a2 + add a6, a2, a4 + +2: iii a5, 0 + iii a5, XCHAL_ICACHE_LINESIZE + iii a5, XCHAL_ICACHE_LINESIZE * 2 + iii a5, XCHAL_ICACHE_LINESIZE * 3 + + addi a5, a5, XCHAL_ICACHE_LINESIZE * 4 + blt a5, a6, 2b + + addi a3, a3, -1 + addi a2, a2, XCHAL_ICACHE_SIZE / XCHAL_ICACHE_WAYS + bgez a3, 2b + + retw + +#endif + + + + + + |