linux-sg2042/arch/x86/kernel/resource.c

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#include <linux/ioport.h>
#include <asm/e820.h>
static void resource_clip(struct resource *res, resource_size_t start,
resource_size_t end)
{
resource_size_t low = 0, high = 0;
if (res->end < start || res->start > end)
return; /* no conflict */
if (res->start < start)
low = start - res->start;
if (res->end > end)
high = res->end - end;
/* Keep the area above or below the conflict, whichever is larger */
if (low > high)
res->end = start - 1;
else
res->start = end + 1;
}
static void remove_e820_regions(struct resource *avail)
{
int i;
struct e820entry *entry;
for (i = 0; i < e820.nr_map; i++) {
entry = &e820.map[i];
resource_clip(avail, entry->addr,
entry->addr + entry->size - 1);
}
}
void arch_remove_reservations(struct resource *avail)
{
x86: don't exclude low BIOS area when allocating address space for non-PCI cards Commit 30919b0bf356 ("x86: avoid low BIOS area when allocating address space") moved the test for resource allocations that fall within the first 1MB of address space from the PCI-specific path to a generic path, such that all resource allocations will avoid this area. However, this breaks ISA cards which need to allocate a memory region within the first 1MB. An example is the i82365 PCMCIA controller and derivatives like the Ricoh RF5C296/396 which map part of the PCMCIA socket memory address space into the first 1MB of system memory address space. They do not work anymore as no usable memory region exists due to this change: Intel ISA PCIC probe: Ricoh RF5C296/396 ISA-to-PCMCIA at port 0x3e0 ofs 0x00, 2 sockets host opts [0]: none host opts [1]: none ISA irqs (scanned) = 3,4,5,9,10 status change on irq 10 pcmcia_socket pcmcia_socket1: pccard: PCMCIA card inserted into slot 1 pcmcia_socket pcmcia_socket0: cs: IO port probe 0xc00-0xcff: excluding 0xcf8-0xcff pcmcia_socket pcmcia_socket0: cs: IO port probe 0xa00-0xaff: clean. pcmcia_socket pcmcia_socket0: cs: IO port probe 0x100-0x3ff: excluding 0x170-0x177 0x1f0-0x1f7 0x2f8-0x2ff 0x370-0x37f 0x3c0-0x3e7 0x3f0-0x3ff pcmcia_socket pcmcia_socket0: cs: memory probe 0x0a0000-0x0affff: excluding 0xa0000-0xaffff pcmcia_socket pcmcia_socket0: cs: memory probe 0x0b0000-0x0bffff: excluding 0xb0000-0xbffff pcmcia_socket pcmcia_socket0: cs: memory probe 0x0c0000-0x0cffff: excluding 0xc0000-0xcbfff pcmcia_socket pcmcia_socket0: cs: memory probe 0x0d0000-0x0dffff: clean. pcmcia_socket pcmcia_socket0: cs: memory probe 0x0e0000-0x0effff: clean. pcmcia_socket pcmcia_socket0: cs: memory probe 0x60000000-0x60ffffff: clean. pcmcia_socket pcmcia_socket0: cs: memory probe 0xa0000000-0xa0ffffff: clean. pcmcia_socket pcmcia_socket1: cs: IO port probe 0xc00-0xcff: excluding 0xcf8-0xcff pcmcia_socket pcmcia_socket1: cs: IO port probe 0xa00-0xaff: clean. pcmcia_socket pcmcia_socket1: cs: IO port probe 0x100-0x3ff: excluding 0x170-0x177 0x1f0-0x1f7 0x2f8-0x2ff 0x370-0x37f 0x3c0-0x3e7 0x3f0-0x3ff pcmcia_socket pcmcia_socket1: cs: memory probe 0x0a0000-0x0affff: excluding 0xa0000-0xaffff pcmcia_socket pcmcia_socket1: cs: memory probe 0x0b0000-0x0bffff: excluding 0xb0000-0xbffff pcmcia_socket pcmcia_socket1: cs: memory probe 0x0c0000-0x0cffff: excluding 0xc0000-0xcbfff pcmcia_socket pcmcia_socket1: cs: memory probe 0x0d0000-0x0dffff: clean. pcmcia_socket pcmcia_socket1: cs: memory probe 0x0e0000-0x0effff: clean. pcmcia_socket pcmcia_socket1: cs: memory probe 0x60000000-0x60ffffff: clean. pcmcia_socket pcmcia_socket1: cs: memory probe 0xa0000000-0xa0ffffff: clean. pcmcia_socket pcmcia_socket1: cs: memory probe 0x0cc000-0x0effff: excluding 0xe0000-0xeffff pcmcia_socket pcmcia_socket1: cs: unable to map card memory! If filtering out the first 1MB is reverted, everything works as expected. Tested-by: Robert Resch <fli4l@robert.reschpara.de> Signed-off-by: Christoph Schulz <develop@kristov.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v2.6.37+
2014-07-16 16:00:57 +08:00
/*
* Trim out BIOS area (high 2MB) and E820 regions. We do not remove
* the low 1MB unconditionally, as this area is needed for some ISA
* cards requiring a memory range, e.g. the i82365 PCMCIA controller.
*/
if (avail->flags & IORESOURCE_MEM) {
resource_clip(avail, BIOS_ROM_BASE, BIOS_ROM_END);
remove_e820_regions(avail);
}
}