luck/tmp_suning_uos_patched
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Pull ar-k0-usage into release branch

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Tony Luck 2005-10-28 11:16:32 -07:00
commit 0ace57a96b
1 changed files with 16 additions and 13 deletions
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29
arch/ia64/kernel/setup.c
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@ -244,28 +244,31 @@ find_initrd (void)
static void __init static void __init
io_port_init (void) io_port_init (void)
{ {
extern unsigned long ia64_iobase;
unsigned long phys_iobase; unsigned long phys_iobase;
/* /*
* Set `iobase' to the appropriate address in region 6 (uncached access range). * Set `iobase' based on the EFI memory map or, failing that, the
* value firmware left in ar.k0.
* *
* The EFI memory map is the "preferred" location to get the I/O port space base, * Note that in ia32 mode, IN/OUT instructions use ar.k0 to compute
* rather the relying on AR.KR0. This should become more clear in future SAL * the port's virtual address, so ia32_load_state() loads it with a
* specs. We'll fall back to getting it out of AR.KR0 if no appropriate entry is * user virtual address. But in ia64 mode, glibc uses the
* found in the memory map. * *physical* address in ar.k0 to mmap the appropriate area from
* /dev/mem, and the inX()/outX() interfaces use MMIO. In both
* cases, user-mode can only use the legacy 0-64K I/O port space.
*
* ar.k0 is not involved in kernel I/O port accesses, which can use
* any of the I/O port spaces and are done via MMIO using the
* virtual mmio_base from the appropriate io_space[].
*/ */
phys_iobase = efi_get_iobase(); phys_iobase = efi_get_iobase();
if (phys_iobase) if (!phys_iobase) {
/* set AR.KR0 since this is all we use it for anyway */
ia64_set_kr(IA64_KR_IO_BASE, phys_iobase);
else {
phys_iobase = ia64_get_kr(IA64_KR_IO_BASE); phys_iobase = ia64_get_kr(IA64_KR_IO_BASE);
printk(KERN_INFO "No I/O port range found in EFI memory map, falling back " printk(KERN_INFO "No I/O port range found in EFI memory map, "
"to AR.KR0\n"); "falling back to AR.KR0 (0x%lx)\n", phys_iobase);
printk(KERN_INFO "I/O port base = 0x%lx\n", phys_iobase);
} }
ia64_iobase = (unsigned long) ioremap(phys_iobase, 0); ia64_iobase = (unsigned long) ioremap(phys_iobase, 0);
ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase));
/* setup legacy IO port space */ /* setup legacy IO port space */
io_space[0].mmio_base = ia64_iobase; io_space[0].mmio_base = ia64_iobase;