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-rw-r--r--arch/s390/kernel/setup.c67
1 files changed, 53 insertions, 14 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 26b601c2b13..66903eed36e 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -94,6 +94,15 @@ struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
int __initdata memory_end_set;
unsigned long __initdata memory_end;
+unsigned long VMALLOC_START;
+EXPORT_SYMBOL(VMALLOC_START);
+
+unsigned long VMALLOC_END;
+EXPORT_SYMBOL(VMALLOC_END);
+
+struct page *vmemmap;
+EXPORT_SYMBOL(vmemmap);
+
/* An array with a pointer to the lowcore of every CPU. */
struct _lowcore *lowcore_ptr[NR_CPUS];
EXPORT_SYMBOL(lowcore_ptr);
@@ -277,6 +286,15 @@ static int __init early_parse_mem(char *p)
}
early_param("mem", early_parse_mem);
+static int __init parse_vmalloc(char *arg)
+{
+ if (!arg)
+ return -EINVAL;
+ VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
+ return 0;
+}
+early_param("vmalloc", parse_vmalloc);
+
unsigned int user_mode = HOME_SPACE_MODE;
EXPORT_SYMBOL_GPL(user_mode);
@@ -478,8 +496,7 @@ EXPORT_SYMBOL_GPL(real_memory_size);
static void __init setup_memory_end(void)
{
- unsigned long memory_size;
- unsigned long max_mem;
+ unsigned long vmax, vmalloc_size, tmp;
int i;
@@ -489,12 +506,9 @@ static void __init setup_memory_end(void)
memory_end_set = 1;
}
#endif
- memory_size = 0;
+ real_memory_size = 0;
memory_end &= PAGE_MASK;
- max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
- memory_end = min(max_mem, memory_end);
-
/*
* Make sure all chunks are MAX_ORDER aligned so we don't need the
* extra checks that HOLES_IN_ZONE would require.
@@ -514,23 +528,48 @@ static void __init setup_memory_end(void)
chunk->addr = start;
chunk->size = end - start;
}
+ real_memory_size = max(real_memory_size,
+ chunk->addr + chunk->size);
}
+ /* Choose kernel address space layout: 2, 3, or 4 levels. */
+#ifdef CONFIG_64BIT
+ vmalloc_size = VMALLOC_END ?: 128UL << 30;
+ tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
+ tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
+ if (tmp <= (1UL << 42))
+ vmax = 1UL << 42; /* 3-level kernel page table */
+ else
+ vmax = 1UL << 53; /* 4-level kernel page table */
+#else
+ vmalloc_size = VMALLOC_END ?: 96UL << 20;
+ vmax = 1UL << 31; /* 2-level kernel page table */
+#endif
+ /* vmalloc area is at the end of the kernel address space. */
+ VMALLOC_END = vmax;
+ VMALLOC_START = vmax - vmalloc_size;
+
+ /* Split remaining virtual space between 1:1 mapping & vmemmap array */
+ tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
+ tmp = VMALLOC_START - tmp * sizeof(struct page);
+ tmp &= ~((vmax >> 11) - 1); /* align to page table level */
+ tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
+ vmemmap = (struct page *) tmp;
+
+ /* Take care that memory_end is set and <= vmemmap */
+ memory_end = min(memory_end ?: real_memory_size, tmp);
+
+ /* Fixup memory chunk array to fit into 0..memory_end */
for (i = 0; i < MEMORY_CHUNKS; i++) {
struct mem_chunk *chunk = &memory_chunk[i];
- real_memory_size = max(real_memory_size,
- chunk->addr + chunk->size);
- if (chunk->addr >= max_mem) {
+ if (chunk->addr >= memory_end) {
memset(chunk, 0, sizeof(*chunk));
continue;
}
- if (chunk->addr + chunk->size > max_mem)
- chunk->size = max_mem - chunk->addr;
- memory_size = max(memory_size, chunk->addr + chunk->size);
+ if (chunk->addr + chunk->size > memory_end)
+ chunk->size = memory_end - chunk->addr;
}
- if (!memory_end)
- memory_end = memory_size;
}
void *restart_stack __attribute__((__section__(".data")));