diff options
| author | Daniel Hellstrom <daniel@gaisler.com> | 2014-12-03 11:35:52 +0100 |
|---|---|---|
| committer | Daniel Hellstrom <daniel@gaisler.com> | 2014-12-04 12:51:11 +0100 |
| commit | dff1803cfbec3775fff1b9c34cc707c05494dc3b (patch) | |
| tree | dbb8850d94b30f8388f9e3df9a68fc6c99855f74 /c/src/lib/libbsp/sparc/shared/start/start.S | |
| parent | pc386 bsp fix for default mode (diff) | |
| download | rtems-dff1803cfbec3775fff1b9c34cc707c05494dc3b.tar.bz2 | |
SPARC: optimize IRQ enable & disable
* Coding style cleanups.
* Use OS reserved trap 0x89 for IRQ Disable
* Use OS reserved trap 0x8A for IRQ Enable
* Add to SPARC CPU supplement documentation
This will result in faster Disable/Enable code since the
system trap handler does not need to decode which function
the user wants. Besides the IRQ disable/enabled can now
be inline which avoids the caller to take into account that
o0-o7+g1-g4 registers are destroyed by trap handler.
It was also possible to reduce the interrupt trap handler by
five instructions due to this.
Diffstat (limited to 'c/src/lib/libbsp/sparc/shared/start/start.S')
| -rw-r--r-- | c/src/lib/libbsp/sparc/shared/start/start.S | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/c/src/lib/libbsp/sparc/shared/start/start.S b/c/src/lib/libbsp/sparc/shared/start/start.S index 3e0e42e7df..f38fe8cb99 100644 --- a/c/src/lib/libbsp/sparc/shared/start/start.S +++ b/c/src/lib/libbsp/sparc/shared/start/start.S @@ -35,11 +35,20 @@ /* * System call optimized trap table entry */ -#define SYSCALL_TRAP(_vector, _handler) \ +#define IRQDIS_TRAP(_handler) \ mov %psr, %l0 ; \ sethi %hi(_handler), %l4 ; \ jmp %l4+%lo(_handler); \ - subcc %g1, 3, %g0; ! prepare for syscall 3 check + or %l0, 0x0f00, %l3; ! Set PIL=0xf to disable IRQ + +/* + * System call optimized trap table entry + */ +#define IRQEN_TRAP(_handler) \ + mov %psr, %l0 ; \ + sethi %hi(_handler), %l4 ; \ + jmp %l4+%lo(_handler); \ + andn %l0, 0xf00, %l3; ! Set PIL=0 to Enable IRQ /* * Window Overflow optimized trap table entry @@ -183,12 +192,23 @@ SYM(CLOCK_SPEED): * installed before. */ - SYSCALL_TRAP( 0x80, SYM(syscall) ); ! 80 syscall SW trap - SOFT_TRAP; SOFT_TRAP; ! 81 - 82 + TRAP( 0x80, SYM(syscall) ); ! 80 halt syscall SW trap + SOFT_TRAP; SOFT_TRAP; ! 81 - 82 TRAP( 0x83, SYM(window_flush_trap_handler) ); ! 83 flush windows SW trap SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 84 - 87 - SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 88 - 8B + SOFT_TRAP; ! 88 + + /* + * SW Trap 9-15 Reserved for Operating System + * + * SPARC_SWTRAP_IRQDIS + * SPARC_SWTRAP_IRQEN + */ + IRQDIS_TRAP(SYM(syscall_irqdis)); ! 89 IRQ Disable syscall trap + IRQEN_TRAP(SYM(syscall_irqen)); ! 8A IRQ Enable syscall trap + + SOFT_TRAP; ! 8B SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 8C - 8F SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 90 - 93 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 94 - 97 |