The way virtual memory is setup now does not leave space for vmalloc on
32bit system. Make a hole in address space from 2G to 3G for vmalloc on
32 bit.
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
---
lib/x86/vm.c | 42 +++++++++++++++++++++++++++++++-----------
1 files changed, 31 insertions(+), 11 deletions(-)
diff --git a/lib/x86/vm.c b/lib/x86/vm.c
index b34449f..4d0a955 100644
--- a/lib/x86/vm.c
+++ b/lib/x86/vm.c
@@ -135,23 +135,43 @@ struct ljmp {
unsigned short seg;
};
+static void setup_mmu_range(unsigned long *cr3, unsigned long start,
+ unsigned long len)
+{
+ u64 max = (u64)len + (u64)start;
+ u64 phys = start;
+
+ while (phys + LARGE_PAGE_SIZE <= max) {
+ install_large_page(cr3, phys, (void *)(ulong)phys);
+ phys += LARGE_PAGE_SIZE;
+ }
+ while (phys + PAGE_SIZE <= max) {
+ install_page(cr3, phys, (void *)(ulong)phys);
+ phys += PAGE_SIZE;
+ }
+}
+
static void setup_mmu(unsigned long len)
{
unsigned long *cr3 = alloc_page();
- unsigned long phys = 0;
+ memset(cr3, 0, PAGE_SIZE);
+
+#ifdef __x86_64__
if (len < (1ul << 32))
- len = 1ul << 32; /* map mmio 1:1 */
+ len = (1ul << 32); /* map mmio 1:1 */
+
+ setup_mmu_range(cr3, 0, len);
+#else
+ if (len > (1ul << 31))
+ len = (1ul << 31);
+
+ /* 0 - 2G memory, 2G-3G valloc area, 3G-4G mmio */
+ setup_mmu_range(cr3, 0, len);
+ setup_mmu_range(cr3, 3ul << 30, (1ul << 30));
+ vfree_top = (void*)(3ul << 30);
+#endif
- memset(cr3, 0, PAGE_SIZE);
- while (phys + LARGE_PAGE_SIZE <= len) {
- install_large_page(cr3, phys, (void *)phys);
- phys += LARGE_PAGE_SIZE;
- }
- while (phys + PAGE_SIZE <= len) {
- install_page(cr3, phys, (void *)phys);
- phys += PAGE_SIZE;
- }
write_cr3(virt_to_phys(cr3));
#ifndef __x86_64__
write_cr4(X86_CR4_PSE);
--
1.7.2.3
--
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