From 0593f21f1049e2dc8df1e2920c29ce9e93f7a663 Mon Sep 17 00:00:00 2001 From: Stefan Reinauer Date: Mon, 26 Jan 2009 01:10:48 +0000 Subject: Abstract mmap() in physmap.c and only open /dev/mem on the first physmap() call Corresponding to flashrom svn r397 and coreboot v2 svn r3903. Signed-off-by: Stefan Reinauer Signed-off-by: Peter Stuge Acked-by: Peter Stuge --- physmap.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 physmap.c (limited to 'physmap.c') diff --git a/physmap.c b/physmap.c new file mode 100644 index 0000000..65d2569 --- /dev/null +++ b/physmap.c @@ -0,0 +1,58 @@ +#include +#include +#include +#include +#include +#include +#include "flash.h" + +#if defined (__sun) && (defined(__i386) || defined(__amd64)) +# define MEM_DEV "/dev/xsvc" +#else +# define MEM_DEV "/dev/mem" +#endif + +static int fd_mem = -1; + +void *sys_physmap(unsigned long phys_addr, size_t len) +{ + void *virt_addr; + + if (-1 == fd_mem) { + /* Open the memory device UNCACHED. Important for MMIO. */ + if (-1 == (fd_mem = open(MEM_DEV, O_RDWR|O_SYNC))) { + perror("Critical error: open(" MEM_DEV ")"); + exit(1); + } + } + + virt_addr = mmap(0, len, PROT_WRITE|PROT_READ, MAP_SHARED, fd_mem, (off_t)phys_addr); + return MAP_FAILED == virt_addr ? NULL : virt_addr; +} + +void physunmap(void *virt_addr, size_t len) +{ + munmap(virt_addr, len); +} + +void *physmap(const char *descr, unsigned long phys_addr, size_t len) +{ + void *virt_addr = sys_physmap(phys_addr, len); + + if (NULL == virt_addr) { + if (NULL == descr) + descr = "memory"; + fprintf(stderr, "Error accessing %s, 0x%lx bytes at 0x%08lx\n", descr, (unsigned long)len, phys_addr); + perror(MEM_DEV " mmap failed"); + if (EINVAL == errno) { + fprintf(stderr, "In Linux this error can be caused by the CONFIG_NONPROMISC_DEVMEM (<2.6.27),\n"); + fprintf(stderr, "CONFIG_STRICT_DEVMEM (>=2.6.27) and CONFIG_X86_PAT kernel options.\n"); + fprintf(stderr, "Please check if either is enabled in your kernel before reporting a failure.\n"); + fprintf(stderr, "You can override CONFIG_X86_PAT at boot with the nopat kernel parameter but\n"); + fprintf(stderr, "disabling the other option unfortunately requires a kernel recompile. Sorry!\n"); + } + exit(1); + } + + return virt_addr; +} -- cgit v1.1