diff options
Diffstat (limited to 'hwaccess.c')
| -rw-r--r-- | hwaccess.c | 110 |
1 files changed, 42 insertions, 68 deletions
@@ -18,6 +18,20 @@ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ +#define IS_X86 (defined(__i386__) || defined(__x86_64__) || defined(__amd64__)) +#define IS_MIPS (defined (__mips) || defined (__mips__) || defined (__MIPS__) || defined (mips)) +#define IS_PPC (defined(__powerpc__) || defined(__powerpc64__) || defined(__ppc__) || defined(__ppc64__)) +#define IS_ARM (defined (__arm__) || defined (_ARM)) +#if !(IS_X86 || IS_MIPS || IS_PPC || IS_ARM) +#error Unknown architecture +#endif + +#define IS_BSD (defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) || defined(__OpenBSD__)) +#define IS_LINUX (defined(__gnu_linux__) || defined(__linux__)) +#if !(IS_BSD || IS_LINUX || defined(__DJGPP__) || defined(__LIBPAYLOAD__) || defined(__sun)) +#error "Unknown operating system" +#endif + #include <stdint.h> #include <string.h> #include <stdlib.h> @@ -32,30 +46,39 @@ #include "flash.h" #include "hwaccess.h" -#if defined(__i386__) || defined(__x86_64__) +#if IS_X86 && IS_BSD +int io_fd; +#endif -/* sync primitive is not needed because x86 uses uncached accesses - * which have a strongly ordered memory model. +/* Prevent reordering and/or merging of reads/writes to hardware. + * Such reordering and/or merging would break device accesses which depend on the exact access order. */ static inline void sync_primitive(void) { -} - -#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) -int io_fd; +/* This is needed only on PowerPC because... + * - x86 uses uncached accesses which have a strongly ordered memory model and + * - MIPS uses uncached accesses in mode 2 on /dev/mem which has also a strongly ordered memory model + * - ARM uses a strongly ordered memory model for device memories. + */ +#if IS_PPC + asm("eieio" : : : "memory"); #endif +} -int release_io_perms(void *p) +static int release_io_perms(void *p) { +#if IS_X86 #if defined(__DJGPP__) || defined(__LIBPAYLOAD__) -#else -#if defined (__sun) && (defined(__i386) || defined(__amd64)) + /* Nothing to release */ +#elif defined (__sun) sysi86(SI86V86, V86SC_IOPL, 0); -#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined (__DragonFly__) +#elif IS_BSD close(io_fd); -#else +#elif IS_LINUX iopl(0); #endif +#else +/* PCI port I/O support is unimplemented on PPC/MIPS and unavailable on ARM. */ #endif return 0; } @@ -63,81 +86,32 @@ int release_io_perms(void *p) /* Get I/O permissions with automatic permission release on shutdown. */ int rget_io_perms(void) { +#if IS_X86 #if defined(__DJGPP__) || defined(__LIBPAYLOAD__) /* We have full permissions by default. */ - return 0; -#else -#if defined (__sun) && (defined(__i386) || defined(__amd64)) +#elif defined (__sun) if (sysi86(SI86V86, V86SC_IOPL, PS_IOPL) != 0) { -#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined (__DragonFly__) +#elif IS_BSD if ((io_fd = open("/dev/io", O_RDWR)) < 0) { -#else +#elif IS_LINUX if (iopl(3) != 0) { #endif msg_perr("ERROR: Could not get I/O privileges (%s).\n" "You need to be root.\n", strerror(errno)); #if defined (__OpenBSD__) - msg_perr("Please set securelevel=-1 in /etc/rc.securelevel " - "and reboot, or reboot into \n"); + msg_perr("Please set securelevel=-1 in /etc/rc.securelevel and reboot, or reboot into \n"); msg_perr("single user mode.\n"); #endif return 1; } else { register_shutdown(release_io_perms, NULL); } - return 0; +#else +/* PCI port I/O support is unimplemented on PPC/MIPS and unavailable on ARM. */ #endif -} - -#elif defined(__powerpc__) || defined(__powerpc64__) || defined(__ppc__) || defined(__ppc64__) - -static inline void sync_primitive(void) -{ - /* Prevent reordering and/or merging of reads/writes to hardware. - * Such reordering and/or merging would break device accesses which - * depend on the exact access order. - */ - ___asm___ volatile ("eieio" : : : "memory"); -} - -/* PCI port I/O is not yet implemented on PowerPC. */ -int rget_io_perms(void) -{ return 0; } -#elif defined (__mips) || defined (__mips__) || defined (_mips) || defined (mips) - -/* sync primitive is not needed because /dev/mem on MIPS uses uncached accesses - * in mode 2 which has a strongly ordered memory model. - */ -static inline void sync_primitive(void) -{ -} - -/* PCI port I/O is not yet implemented on MIPS. */ -int rget_io_perms(void) -{ - return 0; -} - -#elif defined (__arm__) - -static inline void sync_primitive(void) -{ -} - -int rget_io_perms(void) -{ - return 0; -} - -#else - -#error Unknown architecture - -#endif - void mmio_writeb(uint8_t val, void *addr) { *(volatile uint8_t *) addr = val; |