Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

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

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

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. */