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[POWERPC] Automatically lmb_reserve() initrd 

At present, when an initrd is passed to the kernel used flat device
tree properties, the memory the initrd occupies must also be reserved
in the flat tree's reserve map, or the kernel may overwrite it.  That
makes life more complicated than it could be for the bootwrapper.

This patch makes the kernel automatically reserve the initrd's space.
That in turn requires parsing the initrd parameters earlier than they
are currently, in early_init_dt_scan_chosen() instead of
check_for_initrd().

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
David Gibson 2007-02-28 14:12:29 +11:00 committed by Paul Mackerras
parent eb6de28637
commit 30437b3e74
2 changed files with 25 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/powerpc/kernel/prom.c
View File

@ -719,6 +719,7 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
const char *uname, int depth, void *data)
{
unsigned long *lprop;
u32 *prop;
unsigned long l;
char *p;
@ -760,6 +761,22 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
crashk_res.end = crashk_res.start + *lprop - 1;
#endif
#ifdef CONFIG_BLK_DEV_INITRD
DBG("Looking for initrd properties... ");
prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
if (prop) {
initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4));
prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
if (prop) {
initrd_end = (unsigned long)__va(of_read_ulong(prop, l/4));
initrd_below_start_ok = 1;
} else {
initrd_start = 0;
}
}
DBG("initrd_start=0x%lx initrd_end=0x%lx\n", initrd_start, initrd_end);
#endif /* CONFIG_BLK_DEV_INITRD */
/* Retreive command line */
p = of_get_flat_dt_prop(node, "bootargs", &l);
if (p != NULL && l > 0)
@ -926,6 +943,12 @@ static void __init early_reserve_mem(void)
self_size = initial_boot_params->totalsize;
lmb_reserve(self_base, self_size);
#ifdef CONFIG_BLK_DEV_INITRD
/* then reserve the initrd, if any */
if (initrd_start && (initrd_end > initrd_start))
lmb_reserve(__pa(initrd_start), initrd_end - initrd_start);
#endif /* CONFIG_BLK_DEV_INITRD */
#ifdef CONFIG_PPC32
/*
* Handle the case where we might be booting from an old kexec

22
arch/powerpc/kernel/setup-common.c
View File

@ -304,26 +304,8 @@ struct seq_operations cpuinfo_op = {
void __init check_for_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
const unsigned int *prop;
int len;
DBG(" -> check_for_initrd()\n");
if (of_chosen) {
prop = get_property(of_chosen, "linux,initrd-start", &len);
if (prop != NULL) {
initrd_start = (unsigned long)
__va(of_read_ulong(prop, len / 4));
prop = get_property(of_chosen,
"linux,initrd-end", &len);
if (prop != NULL) {
initrd_end = (unsigned long)
__va(of_read_ulong(prop, len / 4));
initrd_below_start_ok = 1;
} else
initrd_start = 0;
}
}
DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
initrd_start, initrd_end);
/* If we were passed an initrd, set the ROOT_DEV properly if the values
* look sensible. If not, clear initrd reference.