/* highmem.h: virtual kernel memory mappings for high memory * * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * - Derived from include/asm-i386/highmem.h * * See Documentation/frv/mmu-layout.txt for more information. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _ASM_HIGHMEM_H #define _ASM_HIGHMEM_H #ifdef __KERNEL__ #include <linux/init.h> #include <asm/mem-layout.h> #include <asm/spr-regs.h> #include <asm/mb-regs.h> #define NR_TLB_LINES 64 /* number of lines in the TLB */ #ifndef __ASSEMBLY__ #include <linux/interrupt.h> #include <asm/kmap_types.h> #include <asm/pgtable.h> #ifdef CONFIG_DEBUG_HIGHMEM #define HIGHMEM_DEBUG 1 #else #define HIGHMEM_DEBUG 0 #endif /* declarations for highmem.c */ extern unsigned long highstart_pfn, highend_pfn; #define kmap_prot PAGE_KERNEL #define kmap_pte ______kmap_pte_in_TLB extern pte_t *pkmap_page_table; #define flush_cache_kmaps() do { } while (0) /* * Right now we initialize only a single pte table. It can be extended * easily, subsequent pte tables have to be allocated in one physical * chunk of RAM. */ #define LAST_PKMAP PTRS_PER_PTE #define LAST_PKMAP_MASK (LAST_PKMAP - 1) #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); extern void *kmap(struct page *page); extern void kunmap(struct page *page); extern struct page *kmap_atomic_to_page(void *ptr); #endif /* !__ASSEMBLY__ */ /* * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap * gives a more generic (and caching) interface. But kmap_atomic can * be used in IRQ contexts, so in some (very limited) cases we need * it. */ #define KMAP_ATOMIC_CACHE_DAMR 8 #ifndef __ASSEMBLY__ #define __kmap_atomic_primary(type, paddr, ampr) \ ({ \ unsigned long damlr, dampr; \ \ dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \ \ if (type != __KM_CACHE) \ asm volatile("movgs %0,dampr"#ampr :: "r"(dampr) : "memory"); \ else \ asm volatile("movgs %0,iampr"#ampr"\n" \ "movgs %0,dampr"#ampr"\n" \ :: "r"(dampr) : "memory" \ ); \ \ asm("movsg damlr"#ampr",%0" : "=r"(damlr)); \ \ /*printk("DAMR"#ampr": PRIM sl=%d L=%08lx P=%08lx\n", type, damlr, dampr);*/ \ \ (void *) damlr; \ }) #define __kmap_atomic_secondary(slot, paddr) \ ({ \ unsigned long damlr = KMAP_ATOMIC_SECONDARY_FRAME + (slot) * PAGE_SIZE; \ unsigned long dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \ \ asm volatile("movgs %0,tplr \n" \ "movgs %1,tppr \n" \ "tlbpr %0,gr0,#2,#1" \ : : "r"(damlr), "r"(dampr) : "memory"); \ \ /*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/ \ \ (void *) damlr; \ }) static inline void *kmap_atomic(struct page *page, enum km_type type) { unsigned long paddr; pagefault_disable(); paddr = page_to_phys(page); switch (type) { case 0: return __kmap_atomic_primary(0, paddr, 2); case 1: return __kmap_atomic_primary(1, paddr, 3); case 2: return __kmap_atomic_primary(2, paddr, 4); case 3: return __kmap_atomic_primary(3, paddr, 5); case 4: return __kmap_atomic_primary(4, paddr, 6); case 5: return __kmap_atomic_primary(5, paddr, 7); case 6: return __kmap_atomic_primary(6, paddr, 8); case 7: return __kmap_atomic_primary(7, paddr, 9); case 8: return __kmap_atomic_primary(8, paddr, 10); case 9 ... 9 + NR_TLB_LINES - 1: return __kmap_atomic_secondary(type - 9, paddr); default: BUG(); return NULL; } } #define __kunmap_atomic_primary(type, ampr) \ do { \ asm volatile("movgs gr0,dampr"#ampr"\n" ::: "memory"); \ if (type == __KM_CACHE) \ asm volatile("movgs gr0,iampr"#ampr"\n" ::: "memory"); \ } while(0) #define __kunmap_atomic_secondary(slot, vaddr) \ do { \ asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr) : "memory"); \ } while(0) static inline void kunmap_atomic(void *kvaddr, enum km_type type) { switch (type) { case 0: __kunmap_atomic_primary(0, 2); break; case 1: __kunmap_atomic_primary(1, 3); break; case 2: __kunmap_atomic_primary(2, 4); break; case 3: __kunmap_atomic_primary(3, 5); break; case 4: __kunmap_atomic_primary(4, 6); break; case 5: __kunmap_atomic_primary(5, 7); break; case 6: __kunmap_atomic_primary(6, 8); break; case 7: __kunmap_atomic_primary(7, 9); break; case 8: __kunmap_atomic_primary(8, 10); break; case 9 ... 9 + NR_TLB_LINES - 1: __kunmap_atomic_secondary(type - 9, kvaddr); break; default: BUG(); } pagefault_enable(); } #endif /* !__ASSEMBLY__ */ #endif /* __KERNEL__ */ #endif /* _ASM_HIGHMEM_H */