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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2023-02-10 10:52:02 +0100 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2023-02-10 16:15:52 +0100 |
| commit | b993111594a2e49273a056bafd14a28dc04f5e19 (patch) | |
| tree | bdc15a2768ccf6d826f3b7f80998805c097630bc /bsps/sparc/shared/start/start.S | |
| parent | bsps/irq: Clarify interrupt vector operations (diff) | |
| download | rtems-b993111594a2e49273a056bafd14a28dc04f5e19.tar.bz2 | |
bsp/leon3: Move SMP data to start.S
The LEON3_Boot_Cpu global object is only used by start.S. Move the definition
of this object to start.S and use a local symbol .Lbootcpuindex for it.
Use a compare-and-swap instruction to assign the boot CPU. This allows a
concurrent initialization.
Close #4845.
Diffstat (limited to 'bsps/sparc/shared/start/start.S')
| -rw-r--r-- | bsps/sparc/shared/start/start.S | 35 |
1 files changed, 24 insertions, 11 deletions
diff --git a/bsps/sparc/shared/start/start.S b/bsps/sparc/shared/start/start.S index a67c6bc163..8a22f8ff74 100644 --- a/bsps/sparc/shared/start/start.S +++ b/bsps/sparc/shared/start/start.S @@ -493,17 +493,13 @@ SYM(hard_reset): mov %sp, %fp ! set frame pointer #if defined(START_LEON3_ENABLE_SMP) - /* If LEON3_Boot_Cpu < 0 then assign us as boot CPU and continue. */ - set SYM(LEON3_Boot_Cpu), %l0 - ld [%l0], %l1 - tst %l1 - bneg .Lbootcpu - nop - - call SYM(bsp_start_on_secondary_processor) ! does not return - mov %g6, %o0 -.Lbootcpu: - st %l7, [%l0] + /* If .Lbootcpuindex < 0 then assign us as boot CPU and continue. */ + set SYM(.Lbootcpuindex), %l0 + mov -1, %l1 + casa [%l0] (10), %l1, %l7 + cmp %l1, %l7 + bne .Lbootsecondarycpu + nop #endif /* clear the bss */ @@ -527,4 +523,21 @@ SYM(hard_reset): call SYM(boot_card) ! does not return mov %g0, %o0 ! command line +#if defined(START_LEON3_ENABLE_SMP) +.Lbootsecondarycpu: + call SYM(bsp_start_on_secondary_processor) ! does not return + mov %g6, %o0 + + /* + * This is the index of the boot CPU. Set by the first CPU at boot to + * its CPU index. + */ + .section .data, "aw" + .align 4 + .type .Lbootcpuindex, #object + .size .Lbootcpuindex, 4 +.Lbootcpuindex: + .long -1 +#endif + /* end of file */ |