diff options
Diffstat (limited to 'arch/alpha/kernel/head.S')
| -rw-r--r-- | arch/alpha/kernel/head.S | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/arch/alpha/kernel/head.S b/arch/alpha/kernel/head.S new file mode 100644 index 00000000000..4ca2e404708 --- /dev/null +++ b/arch/alpha/kernel/head.S @@ -0,0 +1,99 @@ +/* + * alpha/boot/head.S + * + * initial boot stuff.. At this point, the bootloader has already + * switched into OSF/1 PAL-code, and loaded us at the correct address + * (START_ADDR). So there isn't much left for us to do: just set up + * the kernel global pointer and jump to the kernel entry-point. + */ + +#include <linux/config.h> +#include <asm/system.h> +#include <asm/asm_offsets.h> + +.globl swapper_pg_dir +.globl _stext +swapper_pg_dir=SWAPPER_PGD + + .set noreorder + .globl __start + .ent __start +_stext: +__start: + .prologue 0 + br $27,1f +1: ldgp $29,0($27) + /* We need to get current_task_info loaded up... */ + lda $8,init_thread_union + /* ... and find our stack ... */ + lda $30,0x4000 - SIZEOF_PT_REGS($8) + /* ... and then we can start the kernel. */ + jsr $26,start_kernel + call_pal PAL_halt + .end __start + +#ifdef CONFIG_SMP + .align 3 + .globl __smp_callin + .ent __smp_callin + /* On entry here from SRM console, the HWPCB of the per-cpu + slot for this processor has been loaded. We've arranged + for the UNIQUE value for this process to contain the PCBB + of the target idle task. */ +__smp_callin: + .prologue 1 + ldgp $29,0($27) # First order of business, load the GP. + + call_pal PAL_rduniq # Grab the target PCBB. + mov $0,$16 # Install it. + call_pal PAL_swpctx + + lda $8,0x3fff # Find "current". + bic $30,$8,$8 + + jsr $26,smp_callin + call_pal PAL_halt + .end __smp_callin +#endif /* CONFIG_SMP */ + + # + # The following two functions are needed for supporting SRM PALcode + # on the PC164 (at least), since that PALcode manages the interrupt + # masking, and we cannot duplicate the effort without causing problems + # + + .align 3 + .globl cserve_ena + .ent cserve_ena +cserve_ena: + .prologue 0 + bis $16,$16,$17 + lda $16,52($31) + call_pal PAL_cserve + ret ($26) + .end cserve_ena + + .align 3 + .globl cserve_dis + .ent cserve_dis +cserve_dis: + .prologue 0 + bis $16,$16,$17 + lda $16,53($31) + call_pal PAL_cserve + ret ($26) + .end cserve_dis + + # + # It is handy, on occasion, to make halt actually just loop. + # Putting it here means we dont have to recompile the whole + # kernel. + # + + .align 3 + .globl halt + .ent halt +halt: + .prologue 0 + call_pal PAL_halt + .end halt |