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- #ifndef _ASM_X86_IO_32_H
- #define _ASM_X86_IO_32_H
-
- #include <linux/string.h>
- #include <linux/compiler.h>
-
- /*
- * This file contains the definitions for the x86 IO instructions
- * inb/inw/inl/outb/outw/outl and the "string versions" of the same
- * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
- * versions of the single-IO instructions (inb_p/inw_p/..).
- *
- * This file is not meant to be obfuscating: it's just complicated
- * to (a) handle it all in a way that makes gcc able to optimize it
- * as well as possible and (b) trying to avoid writing the same thing
- * over and over again with slight variations and possibly making a
- * mistake somewhere.
- */
-
- /*
- * Thanks to James van Artsdalen for a better timing-fix than
- * the two short jumps: using outb's to a nonexistent port seems
- * to guarantee better timings even on fast machines.
- *
- * On the other hand, I'd like to be sure of a non-existent port:
- * I feel a bit unsafe about using 0x80 (should be safe, though)
- *
- * Linus
- */
-
- /*
- * Bit simplified and optimized by Jan Hubicka
- * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
- *
- * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
- * isa_read[wl] and isa_write[wl] fixed
- * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
- */
-
- #define IO_SPACE_LIMIT 0xffff
-
- #define XQUAD_PORTIO_BASE 0xfe400000
- #define XQUAD_PORTIO_QUAD 0x40000 /* 256k per quad. */
-
- #ifdef __KERNEL__
-
- #include <asm-generic/iomap.h>
-
- #include <linux/vmalloc.h>
-
- /*
- * Convert a virtual cached pointer to an uncached pointer
- */
- #define xlate_dev_kmem_ptr(p) p
-
- /**
- * virt_to_phys - map virtual addresses to physical
- * @address: address to remap
- *
- * The returned physical address is the physical (CPU) mapping for
- * the memory address given. It is only valid to use this function on
- * addresses directly mapped or allocated via kmalloc.
- *
- * This function does not give bus mappings for DMA transfers. In
- * almost all conceivable cases a device driver should not be using
- * this function
- */
-
- static inline unsigned long virt_to_phys(volatile void *address)
- {
- return __pa(address);
- }
-
- /**
- * phys_to_virt - map physical address to virtual
- * @address: address to remap
- *
- * The returned virtual address is a current CPU mapping for
- * the memory address given. It is only valid to use this function on
- * addresses that have a kernel mapping
- *
- * This function does not handle bus mappings for DMA transfers. In
- * almost all conceivable cases a device driver should not be using
- * this function
- */
-
- static inline void *phys_to_virt(unsigned long address)
- {
- return __va(address);
- }
-
- /*
- * Change "struct page" to physical address.
- */
- #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
-
- /**
- * ioremap - map bus memory into CPU space
- * @offset: bus address of the memory
- * @size: size of the resource to map
- *
- * ioremap performs a platform specific sequence of operations to
- * make bus memory CPU accessible via the readb/readw/readl/writeb/
- * writew/writel functions and the other mmio helpers. The returned
- * address is not guaranteed to be usable directly as a virtual
- * address.
- *
- * If the area you are trying to map is a PCI BAR you should have a
- * look at pci_iomap().
- */
- extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
- extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
- extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size,
- unsigned long prot_val);
-
- /*
- * The default ioremap() behavior is non-cached:
- */
- static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
- {
- return ioremap_nocache(offset, size);
- }
-
- extern void iounmap(volatile void __iomem *addr);
-
- /*
- * ISA I/O bus memory addresses are 1:1 with the physical address.
- */
- #define isa_virt_to_bus virt_to_phys
- #define isa_page_to_bus page_to_phys
- #define isa_bus_to_virt phys_to_virt
-
- /*
- * However PCI ones are not necessarily 1:1 and therefore these interfaces
- * are forbidden in portable PCI drivers.
- *
- * Allow them on x86 for legacy drivers, though.
- */
- #define virt_to_bus virt_to_phys
- #define bus_to_virt phys_to_virt
-
- static inline void
- memset_io(volatile void __iomem *addr, unsigned char val, int count)
- {
- memset((void __force *)addr, val, count);
- }
-
- static inline void
- memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
- {
- __memcpy(dst, (const void __force *)src, count);
- }
-
- static inline void
- memcpy_toio(volatile void __iomem *dst, const void *src, int count)
- {
- __memcpy((void __force *)dst, src, count);
- }
-
- /*
- * ISA space is 'always mapped' on a typical x86 system, no need to
- * explicitly ioremap() it. The fact that the ISA IO space is mapped
- * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
- * are physical addresses. The following constant pointer can be
- * used as the IO-area pointer (it can be iounmapped as well, so the
- * analogy with PCI is quite large):
- */
- #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
-
- /*
- * Cache management
- *
- * This needed for two cases
- * 1. Out of order aware processors
- * 2. Accidentally out of order processors (PPro errata #51)
- */
-
- #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
-
- static inline void flush_write_buffers(void)
- {
- asm volatile("lock; addl $0,0(%%esp)": : :"memory");
- }
-
- #else
-
- #define flush_write_buffers() do { } while (0)
-
- #endif
-
- #endif /* __KERNEL__ */
-
- extern void native_io_delay(void);
-
- extern int io_delay_type;
- extern void io_delay_init(void);
-
- #if defined(CONFIG_PARAVIRT)
- #include <asm/paravirt.h>
- #else
-
- static inline void slow_down_io(void)
- {
- native_io_delay();
- #ifdef REALLY_SLOW_IO
- native_io_delay();
- native_io_delay();
- native_io_delay();
- #endif
- }
-
- #endif
-
- #define __BUILDIO(bwl, bw, type) \
- static inline void out##bwl(unsigned type value, int port) \
- { \
- out##bwl##_local(value, port); \
- } \
- \
- static inline unsigned type in##bwl(int port) \
- { \
- return in##bwl##_local(port); \
- }
-
- #define BUILDIO(bwl, bw, type) \
- static inline void out##bwl##_local(unsigned type value, int port) \
- { \
- asm volatile("out" #bwl " %" #bw "0, %w1" \
- : : "a"(value), "Nd"(port)); \
- } \
- \
- static inline unsigned type in##bwl##_local(int port) \
- { \
- unsigned type value; \
- asm volatile("in" #bwl " %w1, %" #bw "0" \
- : "=a"(value) : "Nd"(port)); \
- return value; \
- } \
- \
- static inline void out##bwl##_local_p(unsigned type value, int port) \
- { \
- out##bwl##_local(value, port); \
- slow_down_io(); \
- } \
- \
- static inline unsigned type in##bwl##_local_p(int port) \
- { \
- unsigned type value = in##bwl##_local(port); \
- slow_down_io(); \
- return value; \
- } \
- \
- __BUILDIO(bwl, bw, type) \
- \
- static inline void out##bwl##_p(unsigned type value, int port) \
- { \
- out##bwl(value, port); \
- slow_down_io(); \
- } \
- \
- static inline unsigned type in##bwl##_p(int port) \
- { \
- unsigned type value = in##bwl(port); \
- slow_down_io(); \
- return value; \
- } \
- \
- static inline void outs##bwl(int port, const void *addr, unsigned long count) \
- { \
- asm volatile("rep; outs" #bwl \
- : "+S"(addr), "+c"(count) : "d"(port)); \
- } \
- \
- static inline void ins##bwl(int port, void *addr, unsigned long count) \
- { \
- asm volatile("rep; ins" #bwl \
- : "+D"(addr), "+c"(count) : "d"(port)); \
- }
-
- BUILDIO(b, b, char)
- BUILDIO(w, w, short)
- BUILDIO(l, , int)
-
- #endif /* _ASM_X86_IO_32_H */
-