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| author |   David Gibson <david@gibson.dropbear.id.au> | 2007-02-28 14:12:29 +1100 |
|---|---|---|
| committer |   Paul Mackerras <paulus@samba.org> | 2007-03-08 15:43:35 +1100 |
| commit | 30437b3e743f33e9b68f813ca24e547aa9fcf7d7 (patch) | |
| tree | 6ff8799e8fbfd717f288e7365a5329a01505e9be /arch/powerpc/kernel/prom.c | |
| parent | [POWERPC] Allow duplicate lmb_reserve() calls (diff) | |
| download | linux-dev-30437b3e743f33e9b68f813ca24e547aa9fcf7d7.tar.xz linux-dev-30437b3e743f33e9b68f813ca24e547aa9fcf7d7.zip | |
[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>
Diffstat (limited to 'arch/powerpc/kernel/prom.c')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 15ece3abfb37..ef6bfb70b24a 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -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 |