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authorPaul Mackerras <paulus@samba.org>2006-04-28 02:28:35 -0400
committerPaul Mackerras <paulus@samba.org>2006-04-28 02:28:35 -0400
commitf709bfac48492e289ba78ea1e8c0b3daab264e90 (patch)
tree3820f13761317bf0ac1844aff8b97e8022f5a8cc /arch/powerpc/kernel/prom_init.c
parentf10a04c034c7285a1b15dfa4a83d3e56578e34e8 (diff)
powerpc/pseries: Tell firmware our capabilities on new machines
This adds code to call a new firmware method to tell the firmware what machines and capabilities (such as VMX/Altivec) we support. This will be needed on POWER5+ and POWER6 machines, and it has no effect on past and current machines. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/prom_init.c')
-rw-r--r--arch/powerpc/kernel/prom_init.c111
1 files changed, 107 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 7e4d54821a07..00ad7f981a0d 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -636,10 +636,95 @@ static void __init early_cmdline_parse(void)
636 636
637#ifdef CONFIG_PPC_PSERIES 637#ifdef CONFIG_PPC_PSERIES
638/* 638/*
639 * To tell the firmware what our capabilities are, we have to pass 639 * There are two methods for telling firmware what our capabilities are.
640 * it a fake 32-bit ELF header containing a couple of PT_NOTE sections 640 * Newer machines have an "ibm,client-architecture-support" method on the
641 * that contain structures that contain the actual values. 641 * root node. For older machines, we have to call the "process-elf-header"
642 * method in the /packages/elf-loader node, passing it a fake 32-bit
643 * ELF header containing a couple of PT_NOTE sections that contain
644 * structures that contain various information.
642 */ 645 */
646
647/*
648 * New method - extensible architecture description vector.
649 *
650 * Because the description vector contains a mix of byte and word
651 * values, we declare it as an unsigned char array, and use this
652 * macro to put word values in.
653 */
654#define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
655 ((x) >> 8) & 0xff, (x) & 0xff
656
657/* Option vector bits - generic bits in byte 1 */
658#define OV_IGNORE 0x80 /* ignore this vector */
659#define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
660
661/* Option vector 1: processor architectures supported */
662#define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
663#define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
664#define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
665#define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
666#define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
667#define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
668
669/* Option vector 2: Open Firmware options supported */
670#define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
671
672/* Option vector 3: processor options supported */
673#define OV3_FP 0x80 /* floating point */
674#define OV3_VMX 0x40 /* VMX/Altivec */
675
676/* Option vector 5: PAPR/OF options supported */
677#define OV5_LPAR 0x80 /* logical partitioning supported */
678#define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
679/* ibm,dynamic-reconfiguration-memory property supported */
680#define OV5_DRCONF_MEMORY 0x20
681#define OV5_LARGE_PAGES 0x10 /* large pages supported */
682
683/*
684 * The architecture vector has an array of PVR mask/value pairs,
685 * followed by # option vectors - 1, followed by the option vectors.
686 */
687static unsigned char ibm_architecture_vec[] = {
688 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
689 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
690 5 - 1, /* 5 option vectors */
691
692 /* option vector 1: processor architectures supported */
693 3 - 1, /* length */
694 0, /* don't ignore, don't halt */
695 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
696 OV1_PPC_2_04 | OV1_PPC_2_05,
697
698 /* option vector 2: Open Firmware options supported */
699 34 - 1, /* length */
700 OV2_REAL_MODE,
701 0, 0,
702 W(0xffffffff), /* real_base */
703 W(0xffffffff), /* real_size */
704 W(0xffffffff), /* virt_base */
705 W(0xffffffff), /* virt_size */
706 W(0xffffffff), /* load_base */
707 W(64), /* 128MB min RMA */
708 W(0xffffffff), /* full client load */
709 0, /* min RMA percentage of total RAM */
710 48, /* max log_2(hash table size) */
711
712 /* option vector 3: processor options supported */
713 3 - 1, /* length */
714 0, /* don't ignore, don't halt */
715 OV3_FP | OV3_VMX,
716
717 /* option vector 4: IBM PAPR implementation */
718 2 - 1, /* length */
719 0, /* don't halt */
720
721 /* option vector 5: PAPR/OF options */
722 3 - 1, /* length */
723 0, /* don't ignore, don't halt */
724 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES,
725};
726
727/* Old method - ELF header with PT_NOTE sections */
643static struct fake_elf { 728static struct fake_elf {
644 Elf32_Ehdr elfhdr; 729 Elf32_Ehdr elfhdr;
645 Elf32_Phdr phdr[2]; 730 Elf32_Phdr phdr[2];
@@ -728,8 +813,26 @@ static struct fake_elf {
728 813
729static void __init prom_send_capabilities(void) 814static void __init prom_send_capabilities(void)
730{ 815{
731 ihandle elfloader; 816 ihandle elfloader, root;
817 prom_arg_t ret;
818
819 root = call_prom("open", 1, 1, ADDR("/"));
820 if (root != 0) {
821 /* try calling the ibm,client-architecture-support method */
822 if (call_prom_ret("call-method", 3, 2, &ret,
823 ADDR("ibm,client-architecture-support"),
824 ADDR(ibm_architecture_vec)) == 0) {
825 /* the call exists... */
826 if (ret)
827 prom_printf("WARNING: ibm,client-architecture"
828 "-support call FAILED!\n");
829 call_prom("close", 1, 0, root);
830 return;
831 }
832 call_prom("close", 1, 0, root);
833 }
732 834
835 /* no ibm,client-architecture-support call, try the old way */
733 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader")); 836 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
734 if (elfloader == 0) { 837 if (elfloader == 0) {
735 prom_printf("couldn't open /packages/elf-loader\n"); 838 prom_printf("couldn't open /packages/elf-loader\n");