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-rw-r--r--arch/x86/include/asm/setup.h39
1 files changed, 35 insertions, 4 deletions
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 05c6f6b11fd..bdc2ada05ae 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -64,7 +64,7 @@ extern void x86_quirk_time_init(void);
#include <asm/bootparam.h>
/* Interrupt control for vSMPowered x86_64 systems */
-#ifdef CONFIG_X86_VSMP
+#ifdef CONFIG_X86_64
void vsmp_init(void);
#else
static inline void vsmp_init(void) { }
@@ -100,20 +100,51 @@ extern struct boot_params boot_params;
*/
#define LOWMEMSIZE() (0x9f000)
+/* exceedingly early brk-like allocator */
+extern unsigned long _brk_end;
+void *extend_brk(size_t size, size_t align);
+
+/*
+ * Reserve space in the brk section. The name must be unique within
+ * the file, and somewhat descriptive. The size is in bytes. Must be
+ * used at file scope.
+ *
+ * (This uses a temp function to wrap the asm so we can pass it the
+ * size parameter; otherwise we wouldn't be able to. We can't use a
+ * "section" attribute on a normal variable because it always ends up
+ * being @progbits, which ends up allocating space in the vmlinux
+ * executable.)
+ */
+#define RESERVE_BRK(name,sz) \
+ static void __section(.discard) __used \
+ __brk_reservation_fn_##name##__(void) { \
+ asm volatile ( \
+ ".pushsection .brk_reservation,\"aw\",@nobits;" \
+ ".brk." #name ":" \
+ " 1:.skip %c0;" \
+ " .size .brk." #name ", . - 1b;" \
+ " .popsection" \
+ : : "i" (sz)); \
+ }
+
#ifdef __i386__
void __init i386_start_kernel(void);
extern void probe_roms(void);
-extern unsigned long init_pg_tables_start;
-extern unsigned long init_pg_tables_end;
-
#else
void __init x86_64_start_kernel(char *real_mode);
void __init x86_64_start_reservations(char *real_mode_data);
#endif /* __i386__ */
#endif /* _SETUP */
+#else
+#define RESERVE_BRK(name,sz) \
+ .pushsection .brk_reservation,"aw",@nobits; \
+.brk.name: \
+1: .skip sz; \
+ .size .brk.name,.-1b; \
+ .popsection
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */