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um: Print minimum physical memory requirement 

Print a more sensible message about the minimum physical memory
requirement.

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Thomas Meyer 2015-04-03 16:51:26 +02:00 committed by Richard Weinberger
parent 33bbc30654
commit fe205bdd13
1 changed files with 35 additions and 6 deletions
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41
arch/um/kernel/physmem.c
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@ -57,22 +57,51 @@ void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
extern int __syscall_stub_start;
/**
* setup_physmem() - Setup physical memory for UML
* @start: Start address of the physical kernel memory,
* i.e start address of the executable image.
* @reserve_end: end address of the physical kernel memory.
* @len: Length of total physical memory that should be mapped/made
* available, in bytes.
* @highmem: Number of highmem bytes that should be mapped/made available.
*
* Creates an unlinked temporary file of size (len + highmem) and memory maps
* it on the last executable image address (uml_reserved).
*
* The offset is needed as the length of the total physical memory
* (len + highmem) includes the size of the memory used be the executable image,
* but the mapped-to address is the last address of the executable image
* (uml_reserved == end address of executable image).
*
* The memory mapped memory of the temporary file is used as backing memory
* of all user space processes/kernel tasks.
*/
void __init setup_physmem(unsigned long start, unsigned long reserve_end,
unsigned long len, unsigned long long highmem)
{
unsigned long reserve = reserve_end - start;
int pfn = PFN_UP(__pa(reserve_end));
int delta = (len - reserve) >> PAGE_SHIFT;
int err, offset, bootmap_size;
unsigned long pfn = PFN_UP(__pa(reserve_end));
unsigned long delta = (len - reserve) >> PAGE_SHIFT;
unsigned long offset, bootmap_size;
long map_size;
int err;
offset = uml_reserved - uml_physmem;
map_size = len - offset;
if(map_size <= 0) {
printf("Too few physical memory! Needed=%d, given=%d\n",
offset, len);
exit(1);
}
physmem_fd = create_mem_file(len + highmem);
offset = uml_reserved - uml_physmem;
err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
len - offset, 1, 1, 1);
map_size, 1, 1, 1);
if (err < 0) {
printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
"failed - errno = %d\n", len - offset,
"failed - errno = %d\n", map_size,
(void *) uml_reserved, err);
exit(1);
}