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authorGerald Schaefer <geraldsc@de.ibm.com>2008-04-30 13:38:46 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-04-30 13:38:47 +0200
commit53492b1de46a7576170e865062ffcfc93bb5650b (patch)
treebee94e5b2e8c19c1a094a25023cb82572707feb4 /arch/s390/kernel
parent2e5061e40af88070984e3769eafb5a06022375fd (diff)
[S390] System z large page support.
This adds hugetlbfs support on System z, using both hardware large page support if available and software large page emulation on older hardware. Shared (large) page tables are implemented in software emulation mode, by using page->index of the first tail page from a compound large page to store page table information. Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/early.c16
-rw-r--r--arch/s390/kernel/head64.S2
-rw-r--r--arch/s390/kernel/setup.c10
3 files changed, 24 insertions, 4 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index bd188f6bd0e..d0e09684b9c 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -268,6 +268,19 @@ static noinline __init void setup_lowcore_early(void)
s390_base_pgm_handler_fn = early_pgm_check_handler;
}
+static noinline __init void setup_hpage(void)
+{
+#ifndef CONFIG_DEBUG_PAGEALLOC
+ unsigned int facilities;
+
+ facilities = stfl();
+ if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
+ return;
+ machine_flags |= MACHINE_FLAG_HPAGE;
+ __ctl_set_bit(0, 23);
+#endif
+}
+
static __init void detect_mvpg(void)
{
#ifndef CONFIG_64BIT
@@ -360,6 +373,8 @@ static __init void detect_machine_facilities(void)
facilities = stfl();
if (facilities & (1 << 28))
machine_flags |= MACHINE_FLAG_IDTE;
+ if (facilities & (1 << 23))
+ machine_flags |= MACHINE_FLAG_PFMF;
if (facilities & (1 << 4))
machine_flags |= MACHINE_FLAG_MVCOS;
#endif
@@ -388,6 +403,7 @@ void __init startup_init(void)
detect_diag9c();
detect_diag44();
detect_machine_facilities();
+ setup_hpage();
sclp_read_info_early();
sclp_facilities_detect();
memsize = sclp_memory_detect();
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 9c2c6f7d37e..1d06961e87b 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -129,7 +129,7 @@ startup_continue:
# virtual and never return ...
.align 16
.Lentry:.quad 0x0000000180000000,_stext
-.Lctl: .quad 0x04b50002 # cr0: various things
+.Lctl: .quad 0x04350002 # cr0: various things
.quad 0 # cr1: primary space segment table
.quad .Lduct # cr2: dispatchable unit control table
.quad 0 # cr3: instruction authorization
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 694c6546ce6..2bc70b6e876 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -749,6 +749,9 @@ static void __init setup_hwcaps(void)
elf_hwcap |= 1UL << 6;
}
+ if (MACHINE_HAS_HPAGE)
+ elf_hwcap |= 1UL << 7;
+
switch (cpuinfo->cpu_id.machine) {
case 0x9672:
#if !defined(CONFIG_64BIT)
@@ -872,8 +875,9 @@ void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
static int show_cpuinfo(struct seq_file *m, void *v)
{
- static const char *hwcap_str[7] = {
- "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
+ static const char *hwcap_str[8] = {
+ "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
+ "edat"
};
struct cpuinfo_S390 *cpuinfo;
unsigned long n = (unsigned long) v - 1;
@@ -888,7 +892,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
num_online_cpus(), loops_per_jiffy/(500000/HZ),
(loops_per_jiffy/(5000/HZ))%100);
seq_puts(m, "features\t: ");
- for (i = 0; i < 7; i++)
+ for (i = 0; i < 8; i++)
if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
seq_printf(m, "%s ", hwcap_str[i]);
seq_puts(m, "\n");