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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /arch/x86/kernel/trampoline.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'arch/x86/kernel/trampoline.c')
-rw-r--r--arch/x86/kernel/trampoline.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/x86/kernel/trampoline.c b/arch/x86/kernel/trampoline.c
new file mode 100644
index 00000000..a73b6105
--- /dev/null
+++ b/arch/x86/kernel/trampoline.c
@@ -0,0 +1,42 @@
+#include <linux/io.h>
+#include <linux/memblock.h>
+
+#include <asm/trampoline.h>
+#include <asm/cacheflush.h>
+#include <asm/pgtable.h>
+
+unsigned char *x86_trampoline_base;
+
+void __init setup_trampolines(void)
+{
+ phys_addr_t mem;
+ size_t size = PAGE_ALIGN(x86_trampoline_end - x86_trampoline_start);
+
+ /* Has to be in very low memory so we can execute real-mode AP code. */
+ mem = memblock_find_in_range(0, 1<<20, size, PAGE_SIZE);
+ if (!mem)
+ panic("Cannot allocate trampoline\n");
+
+ x86_trampoline_base = __va(mem);
+ memblock_reserve(mem, size);
+
+ printk(KERN_DEBUG "Base memory trampoline at [%p] %llx size %zu\n",
+ x86_trampoline_base, (unsigned long long)mem, size);
+
+ memcpy(x86_trampoline_base, x86_trampoline_start, size);
+}
+
+/*
+ * setup_trampolines() gets called very early, to guarantee the
+ * availability of low memory. This is before the proper kernel page
+ * tables are set up, so we cannot set page permissions in that
+ * function. Thus, we use an arch_initcall instead.
+ */
+static int __init configure_trampolines(void)
+{
+ size_t size = PAGE_ALIGN(x86_trampoline_end - x86_trampoline_start);
+
+ set_memory_x((unsigned long)x86_trampoline_base, size >> PAGE_SHIFT);
+ return 0;
+}
+arch_initcall(configure_trampolines);