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authorDaniel Ritz <daniel.ritz@gmx.ch>2005-09-09 00:57:14 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 15:25:46 -0700
commitf0eca9626c6becb6fc56106b2e4287c6c784af3d (patch)
tree552a52f367d9d964d4ac3f86ccacfd538aa610c3 /arch/i386
parent41d0ab2a7dfe9e25504169c98eac5e84e5509e3d (diff)
[PATCH] Update PCI IOMEM allocation start
This fixes the problem with "Averatec 6240 pcmcia_socket0: unable to apply power", which was due to the CardBus IOMEM register region being allocated at an address that was actually inside the RAM window that had been reserved for video frame-buffers in an UMA setup. The BIOS _should_ have marked that region reserved in the e820 memory descriptor tables, but did not. It is fixed by rounding up the default starting address of PCI memory allocations, so that we leave a bigger gap after the final known memory location. The amount of rounding depends on how big the unused memory gap is that we can allocate IOMEM from. Based on example code by Linus. Acked-by: Greg KH <greg@kroah.com> Acked-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/kernel/setup.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index fa0c69eb937a..f3d808451d25 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -1300,7 +1300,7 @@ legacy_init_iomem_resources(struct resource *code_resource, struct resource *dat
*/
static void __init register_memory(void)
{
- unsigned long gapstart, gapsize;
+ unsigned long gapstart, gapsize, round;
unsigned long long last;
int i;
@@ -1345,14 +1345,14 @@ static void __init register_memory(void)
}
/*
- * Start allocating dynamic PCI memory a bit into the gap,
- * aligned up to the nearest megabyte.
- *
- * Question: should we try to pad it up a bit (do something
- * like " + (gapsize >> 3)" in there too?). We now have the
- * technology.
+ * See how much we want to round up: start off with
+ * rounding to the next 1MB area.
*/
- pci_mem_start = (gapstart + 0xfffff) & ~0xfffff;
+ round = 0x100000;
+ while ((gapsize >> 4) > round)
+ round += round;
+ /* Fun with two's complement */
+ pci_mem_start = (gapstart + round) & -round;
printk("Allocating PCI resources starting at %08lx (gap: %08lx:%08lx)\n",
pci_mem_start, gapstart, gapsize);