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Diffstat (limited to 'arch/powerpc/kernel/prom_init.c')
-rw-r--r--arch/powerpc/kernel/prom_init.c239
1 files changed, 222 insertions, 17 deletions
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index a909f4e9343..9369287aa8c 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -43,6 +43,7 @@
#include <asm/btext.h>
#include <asm/sections.h>
#include <asm/machdep.h>
+#include <asm/opal.h>
#include <linux/linux_logo.h>
@@ -185,6 +186,7 @@ static unsigned long __initdata prom_tce_alloc_end;
#define PLATFORM_LPAR 0x0001
#define PLATFORM_POWERMAC 0x0400
#define PLATFORM_GENERIC 0x0500
+#define PLATFORM_OPAL 0x0600
static int __initdata of_platform;
@@ -644,7 +646,7 @@ static void __init early_cmdline_parse(void)
}
}
-#ifdef CONFIG_PPC_PSERIES
+#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
/*
* There are two methods for telling firmware what our capabilities are.
* Newer machines have an "ibm,client-architecture-support" method on the
@@ -1274,6 +1276,195 @@ static void __init prom_init_mem(void)
prom_printf(" ram_top : %x\n", RELOC(ram_top));
}
+static void __init prom_close_stdin(void)
+{
+ struct prom_t *_prom = &RELOC(prom);
+ ihandle val;
+
+ if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
+ call_prom("close", 1, 0, val);
+}
+
+#ifdef CONFIG_PPC_POWERNV
+
+static u64 __initdata prom_opal_size;
+static u64 __initdata prom_opal_align;
+static int __initdata prom_rtas_start_cpu;
+static u64 __initdata prom_rtas_data;
+static u64 __initdata prom_rtas_entry;
+
+/* XXX Don't change this structure without updating opal-takeover.S */
+static struct opal_secondary_data {
+ s64 ack; /* 0 */
+ u64 go; /* 8 */
+ struct opal_takeover_args args; /* 16 */
+} opal_secondary_data;
+
+extern char opal_secondary_entry;
+
+static void prom_query_opal(void)
+{
+ long rc;
+
+ prom_printf("Querying for OPAL presence... ");
+ rc = opal_query_takeover(&RELOC(prom_opal_size),
+ &RELOC(prom_opal_align));
+ prom_debug("(rc = %ld) ", rc);
+ if (rc != 0) {
+ prom_printf("not there.\n");
+ return;
+ }
+ RELOC(of_platform) = PLATFORM_OPAL;
+ prom_printf(" there !\n");
+ prom_debug(" opal_size = 0x%lx\n", RELOC(prom_opal_size));
+ prom_debug(" opal_align = 0x%lx\n", RELOC(prom_opal_align));
+ if (RELOC(prom_opal_align) < 0x10000)
+ RELOC(prom_opal_align) = 0x10000;
+}
+
+static int prom_rtas_call(int token, int nargs, int nret, int *outputs, ...)
+{
+ struct rtas_args rtas_args;
+ va_list list;
+ int i;
+
+ rtas_args.token = token;
+ rtas_args.nargs = nargs;
+ rtas_args.nret = nret;
+ rtas_args.rets = (rtas_arg_t *)&(rtas_args.args[nargs]);
+ va_start(list, outputs);
+ for (i = 0; i < nargs; ++i)
+ rtas_args.args[i] = va_arg(list, rtas_arg_t);
+ va_end(list);
+
+ for (i = 0; i < nret; ++i)
+ rtas_args.rets[i] = 0;
+
+ opal_enter_rtas(&rtas_args, RELOC(prom_rtas_data),
+ RELOC(prom_rtas_entry));
+
+ if (nret > 1 && outputs != NULL)
+ for (i = 0; i < nret-1; ++i)
+ outputs[i] = rtas_args.rets[i+1];
+ return (nret > 0)? rtas_args.rets[0]: 0;
+}
+
+static void __init prom_opal_hold_cpus(void)
+{
+ int i, cnt, cpu, rc;
+ long j;
+ phandle node;
+ char type[64];
+ u32 servers[8];
+ struct prom_t *_prom = &RELOC(prom);
+ void *entry = (unsigned long *)&RELOC(opal_secondary_entry);
+ struct opal_secondary_data *data = &RELOC(opal_secondary_data);
+
+ prom_debug("prom_opal_hold_cpus: start...\n");
+ prom_debug(" - entry = 0x%x\n", entry);
+ prom_debug(" - data = 0x%x\n", data);
+
+ data->ack = -1;
+ data->go = 0;
+
+ /* look for cpus */
+ for (node = 0; prom_next_node(&node); ) {
+ type[0] = 0;
+ prom_getprop(node, "device_type", type, sizeof(type));
+ if (strcmp(type, RELOC("cpu")) != 0)
+ continue;
+
+ /* Skip non-configured cpus. */
+ if (prom_getprop(node, "status", type, sizeof(type)) > 0)
+ if (strcmp(type, RELOC("okay")) != 0)
+ continue;
+
+ cnt = prom_getprop(node, "ibm,ppc-interrupt-server#s", servers,
+ sizeof(servers));
+ if (cnt == PROM_ERROR)
+ break;
+ cnt >>= 2;
+ for (i = 0; i < cnt; i++) {
+ cpu = servers[i];
+ prom_debug("CPU %d ... ", cpu);
+ if (cpu == _prom->cpu) {
+ prom_debug("booted !\n");
+ continue;
+ }
+ prom_debug("starting ... ");
+
+ /* Init the acknowledge var which will be reset by
+ * the secondary cpu when it awakens from its OF
+ * spinloop.
+ */
+ data->ack = -1;
+ rc = prom_rtas_call(RELOC(prom_rtas_start_cpu), 3, 1,
+ NULL, cpu, entry, data);
+ prom_debug("rtas rc=%d ...", rc);
+
+ for (j = 0; j < 100000000 && data->ack == -1; j++) {
+ HMT_low();
+ mb();
+ }
+ HMT_medium();
+ if (data->ack != -1)
+ prom_debug("done, PIR=0x%x\n", data->ack);
+ else
+ prom_debug("timeout !\n");
+ }
+ }
+ prom_debug("prom_opal_hold_cpus: end...\n");
+}
+
+static void prom_opal_takeover(void)
+{
+ struct opal_secondary_data *data = &RELOC(opal_secondary_data);
+ struct opal_takeover_args *args = &data->args;
+ u64 align = RELOC(prom_opal_align);
+ u64 top_addr, opal_addr;
+
+ args->k_image = (u64)RELOC(_stext);
+ args->k_size = _end - _stext;
+ args->k_entry = 0;
+ args->k_entry2 = 0x60;
+
+ top_addr = _ALIGN_UP(args->k_size, align);
+
+ if (RELOC(prom_initrd_start) != 0) {
+ args->rd_image = RELOC(prom_initrd_start);
+ args->rd_size = RELOC(prom_initrd_end) - args->rd_image;
+ args->rd_loc = top_addr;
+ top_addr = _ALIGN_UP(args->rd_loc + args->rd_size, align);
+ }
+
+ /* Pickup an address for the HAL. We want to go really high
+ * up to avoid problem with future kexecs. On the other hand
+ * we don't want to be all over the TCEs on P5IOC2 machines
+ * which are going to be up there too. We assume the machine
+ * has plenty of memory, and we ask for the HAL for now to
+ * be just below the 1G point, or above the initrd
+ */
+ opal_addr = _ALIGN_DOWN(0x40000000 - RELOC(prom_opal_size), align);
+ if (opal_addr < top_addr)
+ opal_addr = top_addr;
+ args->hal_addr = opal_addr;
+
+ prom_debug(" k_image = 0x%lx\n", args->k_image);
+ prom_debug(" k_size = 0x%lx\n", args->k_size);
+ prom_debug(" k_entry = 0x%lx\n", args->k_entry);
+ prom_debug(" k_entry2 = 0x%lx\n", args->k_entry2);
+ prom_debug(" hal_addr = 0x%lx\n", args->hal_addr);
+ prom_debug(" rd_image = 0x%lx\n", args->rd_image);
+ prom_debug(" rd_size = 0x%lx\n", args->rd_size);
+ prom_debug(" rd_loc = 0x%lx\n", args->rd_loc);
+ prom_printf("Performing OPAL takeover,this can take a few minutes..\n");
+ prom_close_stdin();
+ mb();
+ data->go = 1;
+ for (;;)
+ opal_do_takeover(args);
+}
+#endif /* CONFIG_PPC_POWERNV */
/*
* Allocate room for and instantiate RTAS
@@ -1326,6 +1517,12 @@ static void __init prom_instantiate_rtas(void)
prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
&entry, sizeof(entry));
+#ifdef CONFIG_PPC_POWERNV
+ /* PowerVN takeover hack */
+ RELOC(prom_rtas_data) = base;
+ RELOC(prom_rtas_entry) = entry;
+ prom_getprop(rtas_node, "start-cpu", &RELOC(prom_rtas_start_cpu), 4);
+#endif
prom_debug("rtas base = 0x%x\n", base);
prom_debug("rtas entry = 0x%x\n", entry);
prom_debug("rtas size = 0x%x\n", (long)size);
@@ -1543,7 +1740,7 @@ static void __init prom_hold_cpus(void)
*acknowledge = (unsigned long)-1;
if (reg != _prom->cpu) {
- /* Primary Thread of non-boot cpu */
+ /* Primary Thread of non-boot cpu or any thread */
prom_printf("starting cpu hw idx %lu... ", reg);
call_prom("start-cpu", 3, 0, node,
secondary_hold, reg);
@@ -1652,15 +1849,6 @@ static void __init prom_init_stdout(void)
prom_setprop(val, path, "linux,boot-display", NULL, 0);
}
-static void __init prom_close_stdin(void)
-{
- struct prom_t *_prom = &RELOC(prom);
- ihandle val;
-
- if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
- call_prom("close", 1, 0, val);
-}
-
static int __init prom_find_machine_type(void)
{
struct prom_t *_prom = &RELOC(prom);
@@ -2504,6 +2692,7 @@ static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
#endif /* CONFIG_BLK_DEV_INITRD */
}
+
/*
* We enter here early on, when the Open Firmware prom is still
* handling exceptions and the MMU hash table for us.
@@ -2565,7 +2754,7 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
*/
prom_check_initrd(r3, r4);
-#ifdef CONFIG_PPC_PSERIES
+#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
/*
* On pSeries, inform the firmware about our capabilities
*/
@@ -2611,14 +2800,30 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
#endif
/*
- * On non-powermacs, try to instantiate RTAS and puts all CPUs
- * in spin-loops. PowerMacs don't have a working RTAS and use
- * a different way to spin CPUs
+ * On non-powermacs, try to instantiate RTAS. PowerMacs don't
+ * have a usable RTAS implementation.
*/
- if (RELOC(of_platform) != PLATFORM_POWERMAC) {
+ if (RELOC(of_platform) != PLATFORM_POWERMAC)
prom_instantiate_rtas();
- prom_hold_cpus();
+
+#ifdef CONFIG_PPC_POWERNV
+ /* Detect HAL and try instanciating it & doing takeover */
+ if (RELOC(of_platform) == PLATFORM_PSERIES_LPAR) {
+ prom_query_opal();
+ if (RELOC(of_platform) == PLATFORM_OPAL) {
+ prom_opal_hold_cpus();
+ prom_opal_takeover();
+ }
}
+#endif
+
+ /*
+ * On non-powermacs, put all CPUs in spin-loops.
+ *
+ * PowerMacs use a different mechanism to spin CPUs
+ */
+ if (RELOC(of_platform) != PLATFORM_POWERMAC)
+ prom_hold_cpus();
/*
* Fill in some infos for use by the kernel later on
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-28 18:09:44 +0000