/* * 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 - 2007 Tensilica Inc. * * Chris Zankel <chris@zankel.net> */ #include <linux/linkage.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/asmmacro.h> #include <asm/cacheasm.h> #include <asm/tlbflush.h> /* * clear_page and clear_user_page are the same for non-cache-aliased configs. * * clear_page (unsigned long page) * a2 */ ENTRY(clear_page) entry a1, 16 movi a3, 0 __loopi a2, a7, PAGE_SIZE, 32 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 __endla a2, a7, 32 retw /* * copy_page and copy_user_page are the same for non-cache-aliased configs. * * copy_page (void *to, void *from) * a2 a3 */ ENTRY(copy_page) entry a1, 16 __loopi a2, a4, PAGE_SIZE, 32 l32i a8, a3, 0 l32i a9, a3, 4 s32i a8, a2, 0 s32i a9, a2, 4 l32i a8, a3, 8 l32i a9, a3, 12 s32i a8, a2, 8 s32i a9, a2, 12 l32i a8, a3, 16 l32i a9, a3, 20 s32i a8, a2, 16 s32i a9, a2, 20 l32i a8, a3, 24 l32i a9, a3, 28 s32i a8, a2, 24 s32i a9, a2, 28 addi a2, a2, 32 addi a3, a3, 32 __endl a2, a4 retw #ifdef CONFIG_MMU /* * If we have to deal with cache aliasing, we use temporary memory mappings * to ensure that the source and destination pages have the same color as * the virtual address. We use way 0 and 1 for temporary mappings in such cases. * * The temporary DTLB entries shouldn't be flushed by interrupts, but are * flushed by preemptive task switches. Special code in the * fast_second_level_miss handler re-established the temporary mapping. * It requires that the PPNs for the destination and source addresses are * in a6, and a7, respectively. */ /* TLB miss exceptions are treated special in the following region */ ENTRY(__tlbtemp_mapping_start) #if (DCACHE_WAY_SIZE > PAGE_SIZE) /* * clear_user_page (void *addr, unsigned long vaddr, struct page *page) * a2 a3 a4 */ ENTRY(clear_user_page) entry a1, 32 /* Mark page dirty and determine alias. */ movi a7, (1 << PG_ARCH_1) l32i a5, a4, PAGE_FLAGS xor a6, a2, a3 extui a3, a3, PAGE_SHIFT, DCACHE_ALIAS_ORDER extui a6, a6, PAGE_SHIFT, DCACHE_ALIAS_ORDER or a5, a5, a7 slli a3, a3, PAGE_SHIFT s32i a5, a4, PAGE_FLAGS /* Skip setting up a temporary DTLB if not aliased. */ beqz a6, 1f /* Invalidate kernel page. */ mov a10, a2 call8 __invalidate_dcache_page /* Setup a temporary DTLB with the color of the VPN */ movi a4, -PAGE_OFFSET + (PAGE_KERNEL | _PAGE_HW_WRITE) movi a5, TLBTEMP_BASE_1 # virt add a6, a2, a4 # ppn add a2, a5, a3 # add 'color' wdtlb a6, a2 dsync 1: movi a3, 0 __loopi a2, a7, PAGE_SIZE, 32 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 __endla a2, a7, 32 bnez a6, 1f retw /* We need to invalidate the temporary idtlb entry, if any. */ 1: addi a2, a2, -PAGE_SIZE idtlb a2 dsync retw /* * copy_page_user (void *to, void *from, unsigned long vaddr, struct page *page) * a2 a3 a4 a5 */ ENTRY(copy_user_page) entry a1, 32 /* Mark page dirty and determine alias for destination. */ movi a8, (1 << PG_ARCH_1) l32i a9, a5, PAGE_FLAGS xor a6, a2, a4 xor a7, a3, a4 extui a4, a4, PAGE_SHIFT, DCACHE_ALIAS_ORDER extui a6, a6, PAGE_SHIFT, DCACHE_ALIAS_ORDER extui a7, a7, PAGE_SHIFT, DCACHE_ALIAS_ORDER or a9, a9, a8 slli a4, a4, PAGE_SHIFT s32i a9, a5, PAGE_FLAGS movi a5, -PAGE_OFFSET + (PAGE_KERNEL | _PAGE_HW_WRITE) beqz a6, 1f /* Invalidate dcache */ mov a10, a2 call8 __invalidate_dcache_page /* Setup a temporary DTLB with a matching color. */ movi a8, TLBTEMP_BASE_1 # base add a6, a2, a5 # ppn add a2, a8, a4 # add 'color' wdtlb a6, a2 dsync /* Skip setting up a temporary DTLB for destination if not aliased. */ 1: beqz a7, 1f /* Setup a temporary DTLB with a matching color. */ movi a8, TLBTEMP_BASE_2 # base add a7, a3, a5 # ppn add a3, a8, a4 addi a8, a3, 1 # way1 wdtlb a7, a8 dsync 1: __loopi a2, a4, PAGE_SIZE, 32 l32i a8, a3, 0 l32i a9, a3, 4 s32i a8, a2, 0 s32i a9, a2, 4 l32i a8, a3, 8 l32i a9, a3, 12 s32i a8, a2, 8 s32i a9, a2, 12 l32i a8, a3, 16 l32i a9, a3, 20 s32i a8, a2, 16 s32i a9, a2, 20 l32i a8, a3, 24 l32i a9, a3, 28 s32i a8, a2, 24 s32i a9, a2, 28 addi a2, a2, 32 addi a3, a3, 32 __endl a2, a4 /* We need to invalidate any temporary mapping! */ bnez a6, 1f bnez a7, 2f retw 1: addi a2, a2, -PAGE_SIZE idtlb a2 dsync bnez a7, 2f retw 2: addi a3, a3, -PAGE_SIZE+1 idtlb a3 dsync retw #endif #if (DCACHE_WAY_SIZE > PAGE_SIZE) /* * void __flush_invalidate_dcache_page_alias (addr, phys) * a2 a3 */ ENTRY(__flush_invalidate_dcache_page_alias) entry sp, 16 movi a7, 0 # required for exception handler addi a6, a3, (PAGE_KERNEL | _PAGE_HW_WRITE) mov a4, a2 wdtlb a6, a2 dsync ___flush_invalidate_dcache_page a2 a3 idtlb a4 dsync retw #endif ENTRY(__tlbtemp_mapping_itlb) #if (ICACHE_WAY_SIZE > PAGE_SIZE) ENTRY(__invalidate_icache_page_alias) entry sp, 16 addi a6, a3, (PAGE_KERNEL_EXEC | _PAGE_HW_WRITE) mov a4, a2 witlb a6, a2 isync ___invalidate_icache_page a2 a3 iitlb a4 isync retw #endif /* End of special treatment in tlb miss exception */ ENTRY(__tlbtemp_mapping_end) #endif /* CONFIG_MMU /* * void __invalidate_icache_page(ulong start) */ ENTRY(__invalidate_icache_page) entry sp, 16 ___invalidate_icache_page a2 a3 isync retw /* * void __invalidate_dcache_page(ulong start) */ ENTRY(__invalidate_dcache_page) entry sp, 16 ___invalidate_dcache_page a2 a3 dsync retw /* * void __flush_invalidate_dcache_page(ulong start) */ ENTRY(__flush_invalidate_dcache_page) entry sp, 16 ___flush_invalidate_dcache_page a2 a3 dsync retw /* * void __flush_dcache_page(ulong start) */ ENTRY(__flush_dcache_page) entry sp, 16 ___flush_dcache_page a2 a3 dsync retw /* * void __invalidate_icache_range(ulong start, ulong size) */ ENTRY(__invalidate_icache_range) entry sp, 16 ___invalidate_icache_range a2 a3 a4 isync retw /* * void __flush_invalidate_dcache_range(ulong start, ulong size) */ ENTRY(__flush_invalidate_dcache_range) entry sp, 16 ___flush_invalidate_dcache_range a2 a3 a4 dsync retw /* * void _flush_dcache_range(ulong start, ulong size) */ ENTRY(__flush_dcache_range) entry sp, 16 ___flush_dcache_range a2 a3 a4 dsync retw /* * void _invalidate_dcache_range(ulong start, ulong size) */ ENTRY(__invalidate_dcache_range) entry sp, 16 ___invalidate_dcache_range a2 a3 a4 retw /* * void _invalidate_icache_all(void) */ ENTRY(__invalidate_icache_all) entry sp, 16 ___invalidate_icache_all a2 a3 isync retw /* * void _flush_invalidate_dcache_all(void) */ ENTRY(__flush_invalidate_dcache_all) entry sp, 16 ___flush_invalidate_dcache_all a2 a3 dsync retw /* * void _invalidate_dcache_all(void) */ ENTRY(__invalidate_dcache_all) entry sp, 16 ___invalidate_dcache_all a2 a3 dsync retw