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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2008-07-25 04:45:44 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 13:53:28 -0400
commit2d6ffcca623a9a16df6cdfbe8250b7a5904a5f5e (patch)
tree70d30cb6516608e9a8a1dce60c59f3a5ff21b305 /arch/cris/arch-v32
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/cris/arch-v32')
-rw-r--r--arch/cris/arch-v32/boot/compressed/misc.c39
1 files changed, 3 insertions, 36 deletions
diff --git a/arch/cris/arch-v32/boot/compressed/misc.c b/arch/cris/arch-v32/boot/compressed/misc.c
index 55b2695c5d70..3595e16e82bc 100644
--- a/arch/cris/arch-v32/boot/compressed/misc.c
+++ b/arch/cris/arch-v32/boot/compressed/misc.c
@@ -89,20 +89,14 @@ static unsigned outcnt = 0; /* bytes in output buffer */
89 89
90static void flush_window(void); 90static void flush_window(void);
91static void error(char *m); 91static void error(char *m);
92static void gzip_mark(void **);
93static void gzip_release(void **);
94 92
95extern char *input_data; /* lives in head.S */ 93extern char *input_data; /* lives in head.S */
96 94
97static long bytes_out = 0; 95static long bytes_out;
98static uch *output_data; 96static uch *output_data;
99static unsigned long output_ptr = 0; 97static unsigned long output_ptr;
100 98
101static void *malloc(int size);
102static void free(void *where);
103static void error(char *m); 99static void error(char *m);
104static void gzip_mark(void **);
105static void gzip_release(void **);
106 100
107static void puts(const char *); 101static void puts(const char *);
108 102
@@ -110,37 +104,10 @@ static void puts(const char *);
110 104
111extern int _end; 105extern int _end;
112static long free_mem_ptr = (long)&_end; 106static long free_mem_ptr = (long)&_end;
107static long free_mem_end_ptr;
113 108
114#include "../../../../../lib/inflate.c" 109#include "../../../../../lib/inflate.c"
115 110
116static void *malloc(int size)
117{
118 void *p;
119
120 if (size <0) error("Malloc error");
121
122 free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
123
124 p = (void *)free_mem_ptr;
125 free_mem_ptr += size;
126
127 return p;
128}
129
130static void free(void *where)
131{ /* Don't care */
132}
133
134static void gzip_mark(void **ptr)
135{
136 *ptr = (void *) free_mem_ptr;
137}
138
139static void gzip_release(void **ptr)
140{
141 free_mem_ptr = (long) *ptr;
142}
143
144/* decompressor info and error messages to serial console */ 111/* decompressor info and error messages to serial console */
145 112
146static inline void 113static inline void