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SPARC: added libcpu lowlevel access and byteorder routines/definitions

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The low level routines can be used in different occasions, it will be
required when accessing PCI.

Note the difference between byteorder.h (inlined functions) and access.S
where the functions will be declared in the library archive librtemscpu.a.
Function names starting with _ are in library and can be referenced by
function pointers.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
This commit is contained in:
Daniel Hellstrom
2012-02-08 15:57:03 +01:00
committed by Gedare Bloom
parent 67baf6071d
commit 80d01b3cf8
9 changed files with 251 additions and 2 deletions
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81
c/src/lib/libcpu/sparc/access/access.S Normal file
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/*
* Optimized access routines for SPARC.
*
* Note the difference between byteorder.h (inlined functions) and access.S
* where the functions will be declared in the library archive librtemscpu.a.
* Function names starting with _ are in library and can be referenced by
* function pointers.
*
* _ldN, _stN standard machine endianess access (SPARC: big-endian)
* _ld_beN, _st_beN forced big-endian
* _ld_leN, _st_leN forced little-endian (defined in access_le.C)
*
* This file is written in assembly because the big-endian functions maps to
* machine dependant access methods, i.e. same function has two names.
*
* COPYRIGHT (c) 2011
* Aeroflex Gaisler.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <rtems/asm.h>
.align 4
.seg "text"
PUBLIC(_ld8)
PUBLIC(_ld16)
PUBLIC(_ld32)
PUBLIC(_ld64)
PUBLIC(_st8)
PUBLIC(_st16)
PUBLIC(_st32)
PUBLIC(_st64)
PUBLIC(_ld_be16)
PUBLIC(_ld_be32)
PUBLIC(_ld_be64)
PUBLIC(_st_be16)
PUBLIC(_st_be32)
PUBLIC(_st_be64)
SYM(_ld8):
retl
ldub [%o0], %o0
SYM(_ld_be16):
SYM(_ld16):
retl
lduh [%o0], %o0
SYM(_ld_be32):
SYM(_ld32):
retl
ld [%o0], %o0
SYM(_ld_be64):
SYM(_ld64):
retl
ldd [%o0], %o0
SYM(_st8):
retl
stub %o1, [%o0]
SYM(_st_be16):
SYM(_st16):
retl
stuh %o1, [%o0]
SYM(_st_be32):
SYM(_st32):
retl
st %o1, [%o0]
SYM(_st_be64):
SYM(_st64):
mov %o2, %o3
mov %o1, %o2
retl
std %o2, [%o0]

32
c/src/lib/libcpu/sparc/access/access_le.c Normal file
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/*
* Little-endian access routines for SPARC
*
* COPYRIGHT (c) 2011
* Aeroflex Gaisler.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <libcpu/byteorder.h>
uint16_t _ld_le16(uint16_t *addr)
{
return ld_le16(addr);
}
void _st_le16(uint16_t *addr, uint16_t val)
{
st_le16(addr, val);
}
uint32_t _ld_le32(uint32_t *addr)
{
return ld_le32(addr);
}
void _st_le32(uint32_t *addr, uint32_t val)
{
st_le32(addr, val);
}