Commit fe205bdd authored by Thomas Meyer's avatar Thomas Meyer Committed by Richard Weinberger
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um: Print minimum physical memory requirement 



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

Signed-off-by: default avatarThomas Meyer <thomas@m3y3r.de>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 33bbc306

arch/um/kernel/physmem.c

+35 −6
Original line number Diff line number Diff line
@@ -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);

	}