aperture_64.c (8c9fd91a0dc503f085169d44f4360be025f75224) aperture_64.c (7677b2ef6c0c4fddc84f6473f3863f40eb71821b)
1/*
2 * Firmware replacement code.
3 *
4 * Work around broken BIOSes that don't set an aperture or only set the
5 * aperture in the AGP bridge.
6 * If all fails map the aperture over some low memory. This is cheaper than
7 * doing bounce buffering. The memory is lost. This is done at early boot
8 * because only the bootmem allocator can allocate 32+MB.

--- 41 unchanged lines hidden (view full) ---

50/* This code runs before the PCI subsystem is initialized, so just
51 access the northbridge directly. */
52
53static u32 __init allocate_aperture(void)
54{
55 u32 aper_size;
56 void *p;
57
1/*
2 * Firmware replacement code.
3 *
4 * Work around broken BIOSes that don't set an aperture or only set the
5 * aperture in the AGP bridge.
6 * If all fails map the aperture over some low memory. This is cheaper than
7 * doing bounce buffering. The memory is lost. This is done at early boot
8 * because only the bootmem allocator can allocate 32+MB.

--- 41 unchanged lines hidden (view full) ---

50/* This code runs before the PCI subsystem is initialized, so just
51 access the northbridge directly. */
52
53static u32 __init allocate_aperture(void)
54{
55 u32 aper_size;
56 void *p;
57
58 if (fallback_aper_order > 7)
59 fallback_aper_order = 7;
58 /* aper_size should <= 1G */
59 if (fallback_aper_order > 5)
60 fallback_aper_order = 5;
60 aper_size = (32 * 1024 * 1024) << fallback_aper_order;
61
62 /*
63 * Aperture has to be naturally aligned. This means a 2GB aperture
64 * won't have much chance of finding a place in the lower 4GB of
65 * memory. Unfortunately we cannot move it up because that would
66 * make the IOMMU useless.
67 */
61 aper_size = (32 * 1024 * 1024) << fallback_aper_order;
62
63 /*
64 * Aperture has to be naturally aligned. This means a 2GB aperture
65 * won't have much chance of finding a place in the lower 4GB of
66 * memory. Unfortunately we cannot move it up because that would
67 * make the IOMMU useless.
68 */
68 p = __alloc_bootmem_nopanic(aper_size, aper_size, 0);
69 /*
70 * using 512M as goal, in case kexec will load kernel_big
71 * that will do the on position decompress, and could overlap with
72 * that positon with gart that is used.
73 * sequende:
74 * kernel_small
75 * ==> kexec (with kdump trigger path or previous doesn't shutdown gart)
76 * ==> kernel_small(gart area become e820_reserved)
77 * ==> kexec (with kdump trigger path or previous doesn't shutdown gart)
78 * ==> kerne_big (uncompressed size will be big than 64M or 128M)
79 * so don't use 512M below as gart iommu, leave the space for kernel
80 * code for safe
81 */
82 p = __alloc_bootmem_nopanic(aper_size, aper_size, 512ULL<<20);
69 if (!p || __pa(p)+aper_size > 0xffffffff) {
70 printk(KERN_ERR
71 "Cannot allocate aperture memory hole (%p,%uK)\n",
72 p, aper_size>>10);
73 if (p)
74 free_bootmem(__pa(p), aper_size);
75 return 0;
76 }

--- 377 unchanged lines hidden --- 		83 if (!p || __pa(p)+aper_size > 0xffffffff) {
84 printk(KERN_ERR
85 "Cannot allocate aperture memory hole (%p,%uK)\n",
86 p, aper_size>>10);
87 if (p)
88 free_bootmem(__pa(p), aper_size);
89 return 0;
90 }

--- 377 unchanged lines hidden ---