![Rusty Russell](/assets/img/avatar_default.png)
paravirt.c used to implement native versions of all low-level functions. Far cleaner is to have the native versions exposed in the headers and as inline native_XXX, and if !CONFIG_PARAVIRT, then simply #define XXX native_XXX. There are several nice side effects: 1) write_dt_entry() now takes the correct "struct Xgt_desc_struct *" not "void *". 2) load_TLS is reintroduced to the for loop, not manually unrolled with a #error in case the bounds ever change. 3) Macros become inlines, with type checking. 4) Access to the native versions is trivial for KVM, lguest, Xen and others who might want it. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@muc.de> Cc: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
346 lines
9.9 KiB
C
346 lines
9.9 KiB
C
#ifndef _ASM_IO_H
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#define _ASM_IO_H
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#include <linux/string.h>
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#include <linux/compiler.h>
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/*
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* This file contains the definitions for the x86 IO instructions
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* inb/inw/inl/outb/outw/outl and the "string versions" of the same
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* (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
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* versions of the single-IO instructions (inb_p/inw_p/..).
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*
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* This file is not meant to be obfuscating: it's just complicated
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* to (a) handle it all in a way that makes gcc able to optimize it
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* as well as possible and (b) trying to avoid writing the same thing
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* over and over again with slight variations and possibly making a
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* mistake somewhere.
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*/
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/*
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* Thanks to James van Artsdalen for a better timing-fix than
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* the two short jumps: using outb's to a nonexistent port seems
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* to guarantee better timings even on fast machines.
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*
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* On the other hand, I'd like to be sure of a non-existent port:
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* I feel a bit unsafe about using 0x80 (should be safe, though)
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*
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* Linus
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*/
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/*
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* Bit simplified and optimized by Jan Hubicka
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* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
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*
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* isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
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* isa_read[wl] and isa_write[wl] fixed
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* - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*/
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#define IO_SPACE_LIMIT 0xffff
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#define XQUAD_PORTIO_BASE 0xfe400000
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#define XQUAD_PORTIO_QUAD 0x40000 /* 256k per quad. */
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#ifdef __KERNEL__
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#include <asm-generic/iomap.h>
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#include <linux/vmalloc.h>
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/*
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* Convert a physical pointer to a virtual kernel pointer for /dev/mem
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* access
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*/
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#define xlate_dev_mem_ptr(p) __va(p)
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/*
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* Convert a virtual cached pointer to an uncached pointer
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*/
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#define xlate_dev_kmem_ptr(p) p
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/**
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* virt_to_phys - map virtual addresses to physical
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* @address: address to remap
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*
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* The returned physical address is the physical (CPU) mapping for
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* the memory address given. It is only valid to use this function on
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* addresses directly mapped or allocated via kmalloc.
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*
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* This function does not give bus mappings for DMA transfers. In
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* almost all conceivable cases a device driver should not be using
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* this function
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*/
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static inline unsigned long virt_to_phys(volatile void * address)
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{
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return __pa(address);
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}
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/**
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* phys_to_virt - map physical address to virtual
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* @address: address to remap
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*
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* The returned virtual address is a current CPU mapping for
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* the memory address given. It is only valid to use this function on
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* addresses that have a kernel mapping
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*
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* This function does not handle bus mappings for DMA transfers. In
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* almost all conceivable cases a device driver should not be using
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* this function
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*/
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static inline void * phys_to_virt(unsigned long address)
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{
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return __va(address);
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}
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/*
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* Change "struct page" to physical address.
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*/
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#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
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extern void __iomem * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
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/**
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* ioremap - map bus memory into CPU space
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* @offset: bus address of the memory
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* @size: size of the resource to map
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*
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* ioremap performs a platform specific sequence of operations to
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* make bus memory CPU accessible via the readb/readw/readl/writeb/
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* writew/writel functions and the other mmio helpers. The returned
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* address is not guaranteed to be usable directly as a virtual
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* address.
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*/
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static inline void __iomem * ioremap(unsigned long offset, unsigned long size)
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{
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return __ioremap(offset, size, 0);
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}
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extern void __iomem * ioremap_nocache(unsigned long offset, unsigned long size);
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extern void iounmap(volatile void __iomem *addr);
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/*
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* bt_ioremap() and bt_iounmap() are for temporary early boot-time
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* mappings, before the real ioremap() is functional.
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* A boot-time mapping is currently limited to at most 16 pages.
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*/
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extern void *bt_ioremap(unsigned long offset, unsigned long size);
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extern void bt_iounmap(void *addr, unsigned long size);
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/* Use early IO mappings for DMI because it's initialized early */
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#define dmi_ioremap bt_ioremap
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#define dmi_iounmap bt_iounmap
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#define dmi_alloc alloc_bootmem
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/*
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* ISA I/O bus memory addresses are 1:1 with the physical address.
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*/
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#define isa_virt_to_bus virt_to_phys
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#define isa_page_to_bus page_to_phys
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#define isa_bus_to_virt phys_to_virt
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/*
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* However PCI ones are not necessarily 1:1 and therefore these interfaces
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* are forbidden in portable PCI drivers.
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*
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* Allow them on x86 for legacy drivers, though.
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*/
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#define virt_to_bus virt_to_phys
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#define bus_to_virt phys_to_virt
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/*
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* readX/writeX() are used to access memory mapped devices. On some
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* architectures the memory mapped IO stuff needs to be accessed
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* differently. On the x86 architecture, we just read/write the
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* memory location directly.
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*/
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static inline unsigned char readb(const volatile void __iomem *addr)
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{
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return *(volatile unsigned char __force *) addr;
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}
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static inline unsigned short readw(const volatile void __iomem *addr)
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{
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return *(volatile unsigned short __force *) addr;
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}
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static inline unsigned int readl(const volatile void __iomem *addr)
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{
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return *(volatile unsigned int __force *) addr;
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}
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#define readb_relaxed(addr) readb(addr)
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#define readw_relaxed(addr) readw(addr)
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#define readl_relaxed(addr) readl(addr)
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#define __raw_readb readb
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#define __raw_readw readw
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#define __raw_readl readl
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static inline void writeb(unsigned char b, volatile void __iomem *addr)
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{
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*(volatile unsigned char __force *) addr = b;
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}
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static inline void writew(unsigned short b, volatile void __iomem *addr)
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{
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*(volatile unsigned short __force *) addr = b;
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}
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static inline void writel(unsigned int b, volatile void __iomem *addr)
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{
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*(volatile unsigned int __force *) addr = b;
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}
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#define __raw_writeb writeb
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#define __raw_writew writew
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#define __raw_writel writel
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#define mmiowb()
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static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
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{
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memset((void __force *) addr, val, count);
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}
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static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
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{
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__memcpy(dst, (void __force *) src, count);
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}
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static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
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{
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__memcpy((void __force *) dst, src, count);
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}
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/*
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* ISA space is 'always mapped' on a typical x86 system, no need to
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* explicitly ioremap() it. The fact that the ISA IO space is mapped
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* to PAGE_OFFSET is pure coincidence - it does not mean ISA values
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* are physical addresses. The following constant pointer can be
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* used as the IO-area pointer (it can be iounmapped as well, so the
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* analogy with PCI is quite large):
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*/
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#define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
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/*
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* Cache management
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*
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* This needed for two cases
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* 1. Out of order aware processors
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* 2. Accidentally out of order processors (PPro errata #51)
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*/
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#if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
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static inline void flush_write_buffers(void)
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{
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__asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory");
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}
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#define dma_cache_inv(_start,_size) flush_write_buffers()
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#define dma_cache_wback(_start,_size) flush_write_buffers()
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#define dma_cache_wback_inv(_start,_size) flush_write_buffers()
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#else
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/* Nothing to do */
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#define dma_cache_inv(_start,_size) do { } while (0)
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#define dma_cache_wback(_start,_size) do { } while (0)
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#define dma_cache_wback_inv(_start,_size) do { } while (0)
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#define flush_write_buffers()
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#endif
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#endif /* __KERNEL__ */
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static inline void native_io_delay(void)
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{
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asm volatile("outb %%al,$0x80" : : : "memory");
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}
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#if defined(CONFIG_PARAVIRT)
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#include <asm/paravirt.h>
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#else
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static inline void slow_down_io(void) {
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native_io_delay();
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#ifdef REALLY_SLOW_IO
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native_io_delay();
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native_io_delay();
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native_io_delay();
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#endif
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}
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#endif
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#ifdef CONFIG_X86_NUMAQ
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extern void *xquad_portio; /* Where the IO area was mapped */
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#define XQUAD_PORT_ADDR(port, quad) (xquad_portio + (XQUAD_PORTIO_QUAD*quad) + port)
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#define __BUILDIO(bwl,bw,type) \
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static inline void out##bwl##_quad(unsigned type value, int port, int quad) { \
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if (xquad_portio) \
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write##bwl(value, XQUAD_PORT_ADDR(port, quad)); \
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else \
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out##bwl##_local(value, port); \
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} \
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static inline void out##bwl(unsigned type value, int port) { \
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out##bwl##_quad(value, port, 0); \
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} \
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static inline unsigned type in##bwl##_quad(int port, int quad) { \
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if (xquad_portio) \
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return read##bwl(XQUAD_PORT_ADDR(port, quad)); \
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else \
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return in##bwl##_local(port); \
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} \
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static inline unsigned type in##bwl(int port) { \
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return in##bwl##_quad(port, 0); \
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}
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#else
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#define __BUILDIO(bwl,bw,type) \
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static inline void out##bwl(unsigned type value, int port) { \
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out##bwl##_local(value, port); \
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} \
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static inline unsigned type in##bwl(int port) { \
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return in##bwl##_local(port); \
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}
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#endif
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#define BUILDIO(bwl,bw,type) \
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static inline void out##bwl##_local(unsigned type value, int port) { \
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__asm__ __volatile__("out" #bwl " %" #bw "0, %w1" : : "a"(value), "Nd"(port)); \
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} \
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static inline unsigned type in##bwl##_local(int port) { \
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unsigned type value; \
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__asm__ __volatile__("in" #bwl " %w1, %" #bw "0" : "=a"(value) : "Nd"(port)); \
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return value; \
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} \
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static inline void out##bwl##_local_p(unsigned type value, int port) { \
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out##bwl##_local(value, port); \
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slow_down_io(); \
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} \
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static inline unsigned type in##bwl##_local_p(int port) { \
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unsigned type value = in##bwl##_local(port); \
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slow_down_io(); \
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return value; \
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} \
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__BUILDIO(bwl,bw,type) \
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static inline void out##bwl##_p(unsigned type value, int port) { \
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out##bwl(value, port); \
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slow_down_io(); \
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} \
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static inline unsigned type in##bwl##_p(int port) { \
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unsigned type value = in##bwl(port); \
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slow_down_io(); \
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return value; \
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} \
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static inline void outs##bwl(int port, const void *addr, unsigned long count) { \
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__asm__ __volatile__("rep; outs" #bwl : "+S"(addr), "+c"(count) : "d"(port)); \
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} \
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static inline void ins##bwl(int port, void *addr, unsigned long count) { \
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__asm__ __volatile__("rep; ins" #bwl : "+D"(addr), "+c"(count) : "d"(port)); \
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}
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BUILDIO(b,b,char)
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BUILDIO(w,w,short)
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BUILDIO(l,,int)
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#endif
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