-
-/*
- * We'd like to use pread/pwrite for configuration space accesses, but
- * unfortunately it isn't simple at all since all libc's until glibc 2.1
- * don't define it.
- */
-
-#if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ > 0
-/* glibc 2.1 or newer -> pread/pwrite supported automatically */
-
-#elif defined(i386) && defined(__GLIBC__)
-/* glibc 2.0 on i386 -> call syscalls directly */
-#include <asm/unistd.h>
-#include <syscall-list.h>
-#ifndef SYS_pread
-#define SYS_pread 180
-#endif
-static int pread(unsigned int fd, void *buf, size_t size, loff_t where)
-{ return syscall(SYS_pread, fd, buf, size, where); }
-#ifndef SYS_pwrite
-#define SYS_pwrite 181
-#endif
-static int pwrite(unsigned int fd, void *buf, size_t size, loff_t where)
-{ return syscall(SYS_pwrite, fd, buf, size, where); }
-
-#elif defined(i386)
-/* old libc on i386 -> call syscalls directly the old way */
-#include <asm/unistd.h>
-static _syscall4(int, pread, unsigned int, fd, void *, buf, size_t, size, loff_t, where);
-static _syscall4(int, pwrite, unsigned int, fd, void *, buf, size_t, size, loff_t, where);
-
-#else
-/* In all other cases we use lseek/read/write instead to be safe */
-#define make_rw_glue(op) \
- static int do_##op(struct pci_dev *d, int fd, void *buf, size_t size, loff_t where) \
- { \
- struct pci_access *a = d->access; \
- int r; \
- if (a->fd_pos != where && lseek(fd, where, SEEK_SET) < 0) \
- return -1; \
- r = op(fd, buf, size); \
- if (r < 0) \
- a->fd_pos = -1; \
- else \
- a->fd_pos = where + r; \
- return r; \
- }
-make_rw_glue(read)
-make_rw_glue(write)
-#define HAVE_DO_READ
-#endif
-
-#ifndef HAVE_DO_READ
-#define do_read(d,f,b,l,p) pread(f,b,l,p)
-#define do_write(d,f,b,l,p) pwrite(f,b,l,p)
-#endif