diff options
| -rw-r--r-- | src/arch/arm/include/ipxe/arm_io.h | 77 |
1 files changed, 59 insertions, 18 deletions
diff --git a/src/arch/arm/include/ipxe/arm_io.h b/src/arch/arm/include/ipxe/arm_io.h index f8765af7..105f22bf 100644 --- a/src/arch/arm/include/ipxe/arm_io.h +++ b/src/arch/arm/include/ipxe/arm_io.h @@ -43,43 +43,84 @@ IOAPI_INLINE ( arm, bus_to_phys ) ( unsigned long bus_addr ) { * */ -#define ARM_READX( _api_func, _type, _insn_suffix, _reg_prefix ) \ +#define ARM_READX( _suffix, _type, _insn_suffix, _reg_prefix ) \ static inline __always_inline _type \ -IOAPI_INLINE ( arm, _api_func ) ( volatile _type *io_addr ) { \ +IOAPI_INLINE ( arm, read ## _suffix ) ( volatile _type *io_addr ) { \ _type data; \ __asm__ __volatile__ ( "ldr" _insn_suffix " %" _reg_prefix "0, %1" \ : "=r" ( data ) : "Qo" ( *io_addr ) ); \ return data; \ } #ifdef __aarch64__ -ARM_READX ( readb, uint8_t, "b", "w" ); -ARM_READX ( readw, uint16_t, "h", "w" ); -ARM_READX ( readl, uint32_t, "", "w" ); -ARM_READX ( readq, uint64_t, "", "" ); +ARM_READX ( b, uint8_t, "b", "w" ); +ARM_READX ( w, uint16_t, "h", "w" ); +ARM_READX ( l, uint32_t, "", "w" ); +ARM_READX ( q, uint64_t, "", "" ); #else -ARM_READX ( readb, uint8_t, "b", "" ); -ARM_READX ( readw, uint16_t, "h", "" ); -ARM_READX ( readl, uint32_t, "", "" ); +ARM_READX ( b, uint8_t, "b", "" ); +ARM_READX ( w, uint16_t, "h", "" ); +ARM_READX ( l, uint32_t, "", "" ); #endif -#define ARM_WRITEX( _api_func, _type, _insn_suffix, _reg_prefix ) \ +#define ARM_WRITEX( _suffix, _type, _insn_suffix, _reg_prefix ) \ static inline __always_inline void \ -IOAPI_INLINE ( arm, _api_func ) ( _type data, volatile _type *io_addr ) { \ +IOAPI_INLINE ( arm, write ## _suffix ) ( _type data, \ + volatile _type *io_addr ) { \ __asm__ __volatile__ ( "str" _insn_suffix " %" _reg_prefix "0, %1" \ : : "r" ( data ), "Qo" ( *io_addr ) ); \ } #ifdef __aarch64__ -ARM_WRITEX ( writeb, uint8_t, "b", "w" ); -ARM_WRITEX ( writew, uint16_t, "h", "w" ); -ARM_WRITEX ( writel, uint32_t, "", "w" ); -ARM_WRITEX ( writeq, uint64_t, "", "" ); +ARM_WRITEX ( b, uint8_t, "b", "w" ); +ARM_WRITEX ( w, uint16_t, "h", "w" ); +ARM_WRITEX ( l, uint32_t, "", "w" ); +ARM_WRITEX ( q, uint64_t, "", "" ); #else -ARM_WRITEX ( writeb, uint8_t, "b", "" ); -ARM_WRITEX ( writew, uint16_t, "h", "" ); -ARM_WRITEX ( writel, uint32_t, "", "" ); +ARM_WRITEX ( b, uint8_t, "b", "" ); +ARM_WRITEX ( w, uint16_t, "h", "" ); +ARM_WRITEX ( l, uint32_t, "", "" ); #endif /* + * Dummy PIO reads and writes up to 32 bits + * + * There is no common standard for I/O-space access for ARM, and + * non-MMIO peripherals are vanishingly rare. Provide dummy + * implementations that will allow code to link and should cause + * drivers to simply fail to detect hardware at runtime. + * + */ + +#define ARM_INX( _suffix, _type ) \ +static inline __always_inline _type \ +IOAPI_INLINE ( arm, in ## _suffix ) ( volatile _type *io_addr __unused) { \ + return ~( (_type) 0 ); \ +} \ +static inline __always_inline void \ +IOAPI_INLINE ( arm, ins ## _suffix ) ( volatile _type *io_addr __unused, \ + _type *data, unsigned int count ) { \ + memset ( data, 0xff, count * sizeof ( *data ) ); \ +} +ARM_INX ( b, uint8_t ); +ARM_INX ( w, uint16_t ); +ARM_INX ( l, uint32_t ); + +#define ARM_OUTX( _suffix, _type ) \ +static inline __always_inline void \ +IOAPI_INLINE ( arm, out ## _suffix ) ( _type data __unused, \ + volatile _type *io_addr __unused ) { \ + /* Do nothing */ \ +} \ +static inline __always_inline void \ +IOAPI_INLINE ( arm, outs ## _suffix ) ( volatile _type *io_addr __unused, \ + const _type *data __unused, \ + unsigned int count __unused ) { \ + /* Do nothing */ \ +} +ARM_OUTX ( b, uint8_t ); +ARM_OUTX ( w, uint16_t ); +ARM_OUTX ( l, uint32_t ); + +/* * Slow down I/O * */ |