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>hifive-unleashed-5.1
Paul Mackerras
parent
f10a04c034
commit
f709bfac48
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@ -636,10 +636,95 @@ static void __init early_cmdline_parse(void)
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#ifdef CONFIG_PPC_PSERIES
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/*
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* To tell the firmware what our capabilities are, we have to pass
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* it a fake 32-bit ELF header containing a couple of PT_NOTE sections
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* that contain structures that contain the actual values.
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* There are two methods for telling firmware what our capabilities are.
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* Newer machines have an "ibm,client-architecture-support" method on the
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* root node. For older machines, we have to call the "process-elf-header"
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* method in the /packages/elf-loader node, passing it a fake 32-bit
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* ELF header containing a couple of PT_NOTE sections that contain
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* structures that contain various information.
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*/
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/*
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* New method - extensible architecture description vector.
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*
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* Because the description vector contains a mix of byte and word
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* values, we declare it as an unsigned char array, and use this
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* macro to put word values in.
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*/
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#define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
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((x) >> 8) & 0xff, (x) & 0xff
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/* Option vector bits - generic bits in byte 1 */
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#define OV_IGNORE 0x80 /* ignore this vector */
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#define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
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/* Option vector 1: processor architectures supported */
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#define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
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#define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
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#define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
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#define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
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#define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
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#define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
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/* Option vector 2: Open Firmware options supported */
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#define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
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/* Option vector 3: processor options supported */
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#define OV3_FP 0x80 /* floating point */
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#define OV3_VMX 0x40 /* VMX/Altivec */
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/* Option vector 5: PAPR/OF options supported */
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#define OV5_LPAR 0x80 /* logical partitioning supported */
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#define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
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/* ibm,dynamic-reconfiguration-memory property supported */
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#define OV5_DRCONF_MEMORY 0x20
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#define OV5_LARGE_PAGES 0x10 /* large pages supported */
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/*
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* The architecture vector has an array of PVR mask/value pairs,
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* followed by # option vectors - 1, followed by the option vectors.
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*/
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static unsigned char ibm_architecture_vec[] = {
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W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
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W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
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5 - 1, /* 5 option vectors */
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/* option vector 1: processor architectures supported */
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3 - 1, /* length */
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0, /* don't ignore, don't halt */
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OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
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OV1_PPC_2_04 | OV1_PPC_2_05,
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/* option vector 2: Open Firmware options supported */
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34 - 1, /* length */
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OV2_REAL_MODE,
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0, 0,
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W(0xffffffff), /* real_base */
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W(0xffffffff), /* real_size */
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W(0xffffffff), /* virt_base */
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W(0xffffffff), /* virt_size */
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W(0xffffffff), /* load_base */
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W(64), /* 128MB min RMA */
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W(0xffffffff), /* full client load */
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0, /* min RMA percentage of total RAM */
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48, /* max log_2(hash table size) */
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/* option vector 3: processor options supported */
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3 - 1, /* length */
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0, /* don't ignore, don't halt */
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OV3_FP | OV3_VMX,
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/* option vector 4: IBM PAPR implementation */
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2 - 1, /* length */
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0, /* don't halt */
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/* option vector 5: PAPR/OF options */
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3 - 1, /* length */
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0, /* don't ignore, don't halt */
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OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES,
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};
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/* Old method - ELF header with PT_NOTE sections */
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static struct fake_elf {
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Elf32_Ehdr elfhdr;
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Elf32_Phdr phdr[2];
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@ -728,8 +813,26 @@ static struct fake_elf {
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static void __init prom_send_capabilities(void)
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{
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ihandle elfloader;
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ihandle elfloader, root;
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prom_arg_t ret;
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root = call_prom("open", 1, 1, ADDR("/"));
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if (root != 0) {
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/* try calling the ibm,client-architecture-support method */
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if (call_prom_ret("call-method", 3, 2, &ret,
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ADDR("ibm,client-architecture-support"),
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ADDR(ibm_architecture_vec)) == 0) {
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/* the call exists... */
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if (ret)
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prom_printf("WARNING: ibm,client-architecture"
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"-support call FAILED!\n");
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call_prom("close", 1, 0, root);
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return;
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}
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call_prom("close", 1, 0, root);
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}
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/* no ibm,client-architecture-support call, try the old way */
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elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
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if (elfloader == 0) {
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prom_printf("couldn't open /packages/elf-loader\n");
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