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>
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@ -57,22 +57,51 @@ void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
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extern int __syscall_stub_start;
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/**
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* setup_physmem() - Setup physical memory for UML
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* @start: Start address of the physical kernel memory,
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* i.e start address of the executable image.
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* @reserve_end: end address of the physical kernel memory.
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* @len: Length of total physical memory that should be mapped/made
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* available, in bytes.
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* @highmem: Number of highmem bytes that should be mapped/made available.
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*
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* Creates an unlinked temporary file of size (len + highmem) and memory maps
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* it on the last executable image address (uml_reserved).
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*
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* The offset is needed as the length of the total physical memory
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* (len + highmem) includes the size of the memory used be the executable image,
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* but the mapped-to address is the last address of the executable image
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* (uml_reserved == end address of executable image).
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*
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* The memory mapped memory of the temporary file is used as backing memory
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* of all user space processes/kernel tasks.
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*/
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void __init setup_physmem(unsigned long start, unsigned long reserve_end,
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unsigned long len, unsigned long long highmem)
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{
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unsigned long reserve = reserve_end - start;
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int pfn = PFN_UP(__pa(reserve_end));
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int delta = (len - reserve) >> PAGE_SHIFT;
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int err, offset, bootmap_size;
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unsigned long pfn = PFN_UP(__pa(reserve_end));
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unsigned long delta = (len - reserve) >> PAGE_SHIFT;
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unsigned long offset, bootmap_size;
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long map_size;
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int err;
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offset = uml_reserved - uml_physmem;
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map_size = len - offset;
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if(map_size <= 0) {
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printf("Too few physical memory! Needed=%d, given=%d\n",
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offset, len);
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exit(1);
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}
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physmem_fd = create_mem_file(len + highmem);
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offset = uml_reserved - uml_physmem;
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err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
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len - offset, 1, 1, 1);
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map_size, 1, 1, 1);
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if (err < 0) {
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printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
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"failed - errno = %d\n", len - offset,
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"failed - errno = %d\n", map_size,
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(void *) uml_reserved, err);
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exit(1);
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}
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