Commit f709bfac authored by Paul Mackerras's avatar Paul Mackerras

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: default avatarPaul Mackerras <paulus@samba.org>
parent f10a04c0
......@@ -636,10 +636,95 @@ static void __init early_cmdline_parse(void)
#ifdef CONFIG_PPC_PSERIES
/*
* To tell the firmware what our capabilities are, we have to pass
* it a fake 32-bit ELF header containing a couple of PT_NOTE sections
* that contain structures that contain the actual values.
* There are two methods for telling firmware what our capabilities are.
* Newer machines have an "ibm,client-architecture-support" method on the
* root node. For older machines, we have to call the "process-elf-header"
* method in the /packages/elf-loader node, passing it a fake 32-bit
* ELF header containing a couple of PT_NOTE sections that contain
* structures that contain various information.
*/
/*
* New method - extensible architecture description vector.
*
* Because the description vector contains a mix of byte and word
* values, we declare it as an unsigned char array, and use this
* macro to put word values in.
*/
#define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
((x) >> 8) & 0xff, (x) & 0xff
/* Option vector bits - generic bits in byte 1 */
#define OV_IGNORE 0x80 /* ignore this vector */
#define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
/* Option vector 1: processor architectures supported */
#define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
#define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
#define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
#define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
#define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
#define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
/* Option vector 2: Open Firmware options supported */
#define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
/* Option vector 3: processor options supported */
#define OV3_FP 0x80 /* floating point */
#define OV3_VMX 0x40 /* VMX/Altivec */
/* Option vector 5: PAPR/OF options supported */
#define OV5_LPAR 0x80 /* logical partitioning supported */
#define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
/* ibm,dynamic-reconfiguration-memory property supported */
#define OV5_DRCONF_MEMORY 0x20
#define OV5_LARGE_PAGES 0x10 /* large pages supported */
/*
* The architecture vector has an array of PVR mask/value pairs,
* followed by # option vectors - 1, followed by the option vectors.
*/
static unsigned char ibm_architecture_vec[] = {
W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
5 - 1, /* 5 option vectors */
/* option vector 1: processor architectures supported */
3 - 1, /* length */
0, /* don't ignore, don't halt */
OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
OV1_PPC_2_04 | OV1_PPC_2_05,
/* option vector 2: Open Firmware options supported */
34 - 1, /* length */
OV2_REAL_MODE,
0, 0,
W(0xffffffff), /* real_base */
W(0xffffffff), /* real_size */
W(0xffffffff), /* virt_base */
W(0xffffffff), /* virt_size */
W(0xffffffff), /* load_base */
W(64), /* 128MB min RMA */
W(0xffffffff), /* full client load */
0, /* min RMA percentage of total RAM */
48, /* max log_2(hash table size) */
/* option vector 3: processor options supported */
3 - 1, /* length */
0, /* don't ignore, don't halt */
OV3_FP | OV3_VMX,
/* option vector 4: IBM PAPR implementation */
2 - 1, /* length */
0, /* don't halt */
/* option vector 5: PAPR/OF options */
3 - 1, /* length */
0, /* don't ignore, don't halt */
OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES,
};
/* Old method - ELF header with PT_NOTE sections */
static struct fake_elf {
Elf32_Ehdr elfhdr;
Elf32_Phdr phdr[2];
......@@ -728,8 +813,26 @@ static struct fake_elf {
static void __init prom_send_capabilities(void)
{
ihandle elfloader;
ihandle elfloader, root;
prom_arg_t ret;
root = call_prom("open", 1, 1, ADDR("/"));
if (root != 0) {
/* try calling the ibm,client-architecture-support method */
if (call_prom_ret("call-method", 3, 2, &ret,
ADDR("ibm,client-architecture-support"),
ADDR(ibm_architecture_vec)) == 0) {
/* the call exists... */
if (ret)
prom_printf("WARNING: ibm,client-architecture"
"-support call FAILED!\n");
call_prom("close", 1, 0, root);
return;
}
call_prom("close", 1, 0, root);
}
/* no ibm,client-architecture-support call, try the old way */
elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
if (elfloader == 0) {
prom_printf("couldn't open /packages/elf-loader\n");
......
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