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-rw-r--r--arch/ppc64/boot/main.c31
1 files changed, 26 insertions, 5 deletions
diff --git a/arch/ppc64/boot/main.c b/arch/ppc64/boot/main.c
index 99e68cfbe688..f7ec19a2d0b0 100644
--- a/arch/ppc64/boot/main.c
+++ b/arch/ppc64/boot/main.c
@@ -23,7 +23,8 @@ extern void flush_cache(void *, unsigned long);
/* Value picked to match that used by yaboot */
#define PROG_START 0x01400000
-#define RAM_END (256<<20) // Fixme: use OF */
+#define RAM_END (512<<20) // Fixme: use OF */
+#define ONE_MB 0x100000
static char *avail_ram;
static char *begin_avail, *end_avail;
@@ -32,6 +33,7 @@ static unsigned int heap_use;
static unsigned int heap_max;
extern char _start[];
+extern char _end[];
extern char _vmlinux_start[];
extern char _vmlinux_end[];
extern char _initrd_start[];
@@ -58,13 +60,13 @@ typedef void (*kernel_entry_t)( unsigned long,
#undef DEBUG
-static unsigned long claim_base = PROG_START;
+static unsigned long claim_base;
static unsigned long try_claim(unsigned long size)
{
unsigned long addr = 0;
- for(; claim_base < RAM_END; claim_base += 0x100000) {
+ for(; claim_base < RAM_END; claim_base += ONE_MB) {
#ifdef DEBUG
printf(" trying: 0x%08lx\n\r", claim_base);
#endif
@@ -95,7 +97,26 @@ void start(unsigned long a1, unsigned long a2, void *promptr)
if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
exit();
- printf("\n\rzImage starting: loaded at 0x%x\n\r", (unsigned)_start);
+ printf("\n\rzImage starting: loaded at 0x%lx\n\r", (unsigned long) _start);
+
+ /*
+ * The first available claim_base must be above the end of the
+ * the loaded kernel wrapper file (_start to _end includes the
+ * initrd image if it is present) and rounded up to a nice
+ * 1 MB boundary for good measure.
+ */
+
+ claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
+
+#if defined(PROG_START)
+ /*
+ * Maintain a "magic" minimum address. This keeps some older
+ * firmware platforms running.
+ */
+
+ if (claim_base < PROG_START)
+ claim_base = PROG_START;
+#endif
/*
* Now we try to claim some memory for the kernel itself
@@ -105,7 +126,7 @@ void start(unsigned long a1, unsigned long a2, void *promptr)
* size... In practice we add 1Mb, that is enough, but we should really
* consider fixing the Makefile to put a _raw_ kernel in there !
*/
- vmlinux_memsize += 0x100000;
+ vmlinux_memsize += ONE_MB;
printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux_memsize);
vmlinux.addr = try_claim(vmlinux_memsize);
if (vmlinux.addr == 0) {