diff options
| -rw-r--r-- | arch/hexagon/include/asm/cache.h | 34 | ||||
| -rw-r--r-- | arch/hexagon/include/asm/cacheflush.h | 99 | ||||
| -rw-r--r-- | arch/hexagon/mm/cache.c | 128 |
3 files changed, 261 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/cache.h b/arch/hexagon/include/asm/cache.h new file mode 100644 index 000000000000..0f01de2eb4ab --- /dev/null +++ b/arch/hexagon/include/asm/cache.h @@ -0,0 +1,34 @@ +/* + * Cache definitions for the Hexagon architecture + * + * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#ifndef __ASM_CACHE_H +#define __ASM_CACHE_H + +/* Bytes per L1 cache line */ +#define L1_CACHE_SHIFT (5) +#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT) + +#define __cacheline_aligned __aligned(L1_CACHE_BYTES) +#define ____cacheline_aligned __aligned(L1_CACHE_BYTES) + +/* See http://kerneltrap.org/node/15100 */ +#define __read_mostly + +#endif diff --git a/arch/hexagon/include/asm/cacheflush.h b/arch/hexagon/include/asm/cacheflush.h new file mode 100644 index 000000000000..6865c1be927a --- /dev/null +++ b/arch/hexagon/include/asm/cacheflush.h @@ -0,0 +1,99 @@ +/* + * Cache flush operations for the Hexagon architecture + * + * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#ifndef _ASM_CACHEFLUSH_H +#define _ASM_CACHEFLUSH_H + +#include <linux/cache.h> +#include <linux/mm.h> +#include <asm/string.h> +#include <asm-generic/cacheflush.h> + +/* Cache flushing: + * + * - flush_cache_all() flushes entire cache + * - flush_cache_mm(mm) flushes the specified mm context's cache lines + * - flush_cache_page(mm, vmaddr, pfn) flushes a single page + * - flush_cache_range(vma, start, end) flushes a range of pages + * - flush_icache_range(start, end) flush a range of instructions + * - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache + * - flush_icache_page(vma, pg) flushes(invalidates) a page for icache + * + * Need to doublecheck which one is really needed for ptrace stuff to work. + */ +#define LINESIZE 32 +#define LINEBITS 5 + +/* + * Flush Dcache range through current map. + */ +extern void flush_dcache_range(unsigned long start, unsigned long end); + +/* + * Flush Icache range through current map. + */ +#undef flush_icache_range +extern void flush_icache_range(unsigned long start, unsigned long end); + +/* + * Memory-management related flushes are there to ensure in non-physically + * indexed cache schemes that stale lines belonging to a given ASID aren't + * in the cache to confuse things. The prototype Hexagon Virtual Machine + * only uses a single ASID for all user-mode maps, which should + * mean that they aren't necessary. A brute-force, flush-everything + * implementation, with the name xxxxx_hexagon() is present in + * arch/hexagon/mm/cache.c, but let's not wire it up until we know + * it is needed. + */ +extern void flush_cache_all_hexagon(void); + +/* + * This may or may not ever have to be non-null, depending on the + * virtual machine MMU. For a native kernel, it's definitiely a no-op + * + * This is also the place where deferred cache coherency stuff seems + * to happen, classically... but instead we do it like ia64 and + * clean the cache when the PTE is set. + * + */ +static inline void update_mmu_cache(struct vm_area_struct *vma, + unsigned long address, pte_t *ptep) +{ + /* generic_ptrace_pokedata doesn't wind up here, does it? */ +} + +#undef copy_to_user_page +static inline void copy_to_user_page(struct vm_area_struct *vma, + struct page *page, + unsigned long vaddr, + void *dst, void *src, int len) +{ + memcpy(dst, src, len); + if (vma->vm_flags & VM_EXEC) { + flush_icache_range((unsigned long) dst, + (unsigned long) dst + len); + } +} + + +extern void hexagon_inv_dcache_range(unsigned long start, unsigned long end); +extern void hexagon_clean_dcache_range(unsigned long start, unsigned long end); + +#endif diff --git a/arch/hexagon/mm/cache.c b/arch/hexagon/mm/cache.c new file mode 100644 index 000000000000..c5cf6ee27587 --- /dev/null +++ b/arch/hexagon/mm/cache.c @@ -0,0 +1,128 @@ +/* + * Cache management functions for Hexagon + * + * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#include <linux/mm.h> +#include <asm/cacheflush.h> +#include <asm/hexagon_vm.h> + +#define spanlines(start, end) \ + (((end - (start & ~(LINESIZE - 1))) >> LINEBITS) + 1) + +void flush_dcache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dccleaninva(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + local_irq_restore(flags); +} + +void flush_icache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dccleana(%0); " + " icinva(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + __asm__ __volatile__ ( + "isync" + ); + local_irq_restore(flags); +} + +void hexagon_clean_dcache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dccleana(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + local_irq_restore(flags); +} + +void hexagon_inv_dcache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dcinva(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + local_irq_restore(flags); +} + + + + +/* + * This is just really brutal and shouldn't be used anyways, + * especially on V2. Left here just in case. + */ +void flush_cache_all_hexagon(void) +{ + unsigned long flags; + local_irq_save(flags); + __vmcache_ickill(); + __vmcache_dckill(); + __vmcache_l2kill(); + local_irq_restore(flags); + mb(); +} |