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[POWERPC] Setup RTAS values earlier, to enable rtas_call() earlier 

Althought RTAS is instantiated when we enter the kernel, we can't actually
call into it until we know its entry point address. Currently we grab that
in rtas_initialize(), however that's quite late in the boot sequence.

To enable rtas_call() earlier, we can grab the RTAS entry etc. values while
we're scanning the flattened device tree. There's existing code to retrieve
the values from /chosen, however we don't store them there anymore, so remove
that code.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2006-06-23 18:20:13 +10:00 committed by Paul Mackerras
parent ab3ab74d9b
commit 458148c00b
3 changed files with 30 additions and 18 deletions
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23
arch/powerpc/kernel/prom.c
View File

@ -1125,24 +1125,6 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
tce_alloc_end = *lprop;
#endif
#ifdef CONFIG_PPC_RTAS
/* To help early debugging via the front panel, we retrieve a minimal
* set of RTAS infos now if available
*/
{
u64 *basep, *entryp, *sizep;
basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
sizep = of_get_flat_dt_prop(node, "linux,rtas-size", NULL);
if (basep && entryp && sizep) {
rtas.base = *basep;
rtas.entry = *entryp;
rtas.size = *sizep;
}
}
#endif /* CONFIG_PPC_RTAS */
#ifdef CONFIG_KEXEC
lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
if (lprop)
@ -1327,6 +1309,11 @@ void __init early_init_devtree(void *params)
/* Setup flat device-tree pointer */
initial_boot_params = params;
#ifdef CONFIG_PPC_RTAS
/* Some machines might need RTAS info for debugging, grab it now. */
of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
#endif
/* Retrieve various informations from the /chosen node of the
* device-tree, including the platform type, initrd location and
* size, TCE reserve, and more ...

22
arch/powerpc/kernel/rtas.c
View File

@ -801,3 +801,25 @@ void __init rtas_initialize(void)
rtas_last_error_token = rtas_token("rtas-last-error");
#endif
}
int __init early_init_dt_scan_rtas(unsigned long node,
const char *uname, int depth, void *data)
{
u32 *basep, *entryp, *sizep;
if (depth != 1 || strcmp(uname, "rtas") != 0)
return 0;
basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
if (basep && entryp && sizep) {
rtas.base = *basep;
rtas.entry = *entryp;
rtas.size = *sizep;
}
/* break now */
return 1;
}

3
include/asm-powerpc/rtas.h
View File

@ -181,6 +181,9 @@ extern int rtas_set_rtc_time(struct rtc_time *rtc_time);
extern unsigned int rtas_busy_delay_time(int status);
extern unsigned int rtas_busy_delay(int status);
extern int early_init_dt_scan_rtas(unsigned long node,
const char *uname, int depth, void *data);
extern void pSeries_log_error(char *buf, unsigned int err_type, int fatal);
/* Error types logged. */