path: root/arch/alpha/boot
diff options
authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2008-07-25 01:45:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:28 -0700
commit2d6ffcca623a9a16df6cdfbe8250b7a5904a5f5e (patch)
tree70d30cb6516608e9a8a1dce60c59f3a5ff21b305 /arch/alpha/boot
parentba92a43dbaee339cf5915ef766d3d3ffbaaf103c (diff)
inflate: refactor inflate malloc code
Inflate requires some dynamic memory allocation very early in the boot process and this is provided with a set of four functions: malloc/free/gzip_mark/gzip_release. The old inflate code used a mark/release strategy rather than implement free. This new version instead keeps a count on the number of outstanding allocations and when it hits zero, it resets the malloc arena. This allows removing all the mark and release implementations and unifying all the malloc/free implementations. The architecture-dependent code must define two addresses: - free_mem_ptr, the address of the beginning of the area in which allocations should be made - free_mem_end_ptr, the address of the end of the area in which allocations should be made. If set to 0, then no check is made on the number of allocations, it just grows as much as needed The architecture-dependent code can also provide an arch_decomp_wdog() function call. This function will be called several times during the decompression process, and allow to notify the watchdog that the system is still running. If an architecture provides such a call, then it must define ARCH_HAS_DECOMP_WDOG so that the generic inflate code calls arch_decomp_wdog(). Work initially done by Matt Mackall, updated to a recent version of the kernel and improved by me. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Matt Mackall <mpm@selenic.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Mikael Starvik <mikael.starvik@axis.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: David Howells <dhowells@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andi Kleen <andi@firstfloor.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Acked-by: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/alpha/boot')
1 files changed, 2 insertions, 37 deletions
diff --git a/arch/alpha/boot/misc.c b/arch/alpha/boot/misc.c
index c00646b25f6e..3047a1b3a517 100644
--- a/arch/alpha/boot/misc.c
+++ b/arch/alpha/boot/misc.c
@@ -78,8 +78,6 @@ static unsigned outcnt; /* bytes in output buffer */
static int fill_inbuf(void);
static void flush_window(void);
static void error(char *m);
-static void gzip_mark(void **);
-static void gzip_release(void **);
static char *input_data;
static int input_data_size;
@@ -88,51 +86,18 @@ static uch *output_data;
static ulg output_ptr;
static ulg bytes_out;
-static void *malloc(int size);
-static void free(void *where);
static void error(char *m);
static void gzip_mark(void **);
static void gzip_release(void **);
extern int end;
static ulg free_mem_ptr;
-static ulg free_mem_ptr_end;
+static ulg free_mem_end_ptr;
#define HEAP_SIZE 0x3000
#include "../../../lib/inflate.c"
-static void *malloc(int size)
- void *p;
- if (size <0) error("Malloc error");
- if (free_mem_ptr <= 0) error("Memory error");
- free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
- p = (void *)free_mem_ptr;
- free_mem_ptr += size;
- if (free_mem_ptr >= free_mem_ptr_end)
- error("Out of memory");
- return p;
-static void free(void *where)
-{ /* gzip_mark & gzip_release do the free */
-static void gzip_mark(void **ptr)
- *ptr = (void *) free_mem_ptr;
-static void gzip_release(void **ptr)
- free_mem_ptr = (long) *ptr;
/* ===========================================================================
* Fill the input buffer. This is called only when the buffer is empty
* and at least one byte is really needed.
@@ -193,7 +158,7 @@ decompress_kernel(void *output_start,
free_mem_ptr = (ulg)output_start + ksize;
- free_mem_ptr_end = (ulg)output_start + ksize + 0x200000;
+ free_mem_end_ptr = (ulg)output_start + ksize + 0x200000;
/* put in temp area to reduce initial footprint */