77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "flash.h"
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#ifdef __DARWIN__
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#include <DirectIO/darwinio.h>
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#define MEM_DEV "DirectIO"
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void *sys_physmap(unsigned long phys_addr, size_t len)
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{
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return map_physical(phys_addr, len);
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}
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void physunmap(void *virt_addr, size_t len)
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{
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unmap_physical(virt_addr, len);
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}
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#else
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#include <sys/mman.h>
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#if defined (__sun) && (defined(__i386) || defined(__amd64))
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# define MEM_DEV "/dev/xsvc"
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#else
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# define MEM_DEV "/dev/mem"
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#endif
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static int fd_mem = -1;
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void *sys_physmap(unsigned long phys_addr, size_t len)
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{
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void *virt_addr;
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if (-1 == fd_mem) {
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/* Open the memory device UNCACHED. Important for MMIO. */
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if (-1 == (fd_mem = open(MEM_DEV, O_RDWR|O_SYNC))) {
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perror("Critical error: open(" MEM_DEV ")");
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exit(1);
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}
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}
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virt_addr = mmap(0, len, PROT_WRITE|PROT_READ, MAP_SHARED, fd_mem, (off_t)phys_addr);
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return MAP_FAILED == virt_addr ? NULL : virt_addr;
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}
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void physunmap(void *virt_addr, size_t len)
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{
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munmap(virt_addr, len);
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}
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#endif
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void *physmap(const char *descr, unsigned long phys_addr, size_t len)
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{
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void *virt_addr = sys_physmap(phys_addr, len);
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if (NULL == virt_addr) {
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if (NULL == descr)
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descr = "memory";
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fprintf(stderr, "Error accessing %s, 0x%lx bytes at 0x%08lx\n", descr, (unsigned long)len, phys_addr);
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perror(MEM_DEV " mmap failed");
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if (EINVAL == errno) {
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fprintf(stderr, "In Linux this error can be caused by the CONFIG_NONPROMISC_DEVMEM (<2.6.27),\n");
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fprintf(stderr, "CONFIG_STRICT_DEVMEM (>=2.6.27) and CONFIG_X86_PAT kernel options.\n");
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fprintf(stderr, "Please check if either is enabled in your kernel before reporting a failure.\n");
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fprintf(stderr, "You can override CONFIG_X86_PAT at boot with the nopat kernel parameter but\n");
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fprintf(stderr, "disabling the other option unfortunately requires a kernel recompile. Sorry!\n");
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}
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exit(1);
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}
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return virt_addr;
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}
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