[PATCH] x86_64: Introduce e820_all_mapped
Introduce a e820_all_mapped() function which checks if the entire range <start,end> is mapped with type. This is done by moving the local start variable to the end of each known-good region; if at the end of the function the start address is still before end, there must be a part that's not of the correct type; otherwise it's a good region. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -963,6 +963,36 @@ efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)
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return 0;
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}
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/*
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* This function checks if the entire range <start,end> is mapped with type.
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*
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* Note: this function only works correct if the e820 table is sorted and
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* not-overlapping, which is the case
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*/
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int __init
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e820_all_mapped(unsigned long start, unsigned long end, unsigned type)
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{
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int i;
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for (i = 0; i < e820.nr_map; i++) {
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struct e820entry *ei = &e820.map[i];
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if (type && ei->type != type)
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continue;
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/* is the region (part) in overlap with the current region ?*/
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if (ei->addr >= end || ei->addr + ei->size <= start)
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continue;
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/* if the region is at the beginning of <start,end> we move
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* start to the end of the region since it's ok until there
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*/
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if (ei->addr <= start)
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start = ei->addr + ei->size;
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/* if start is now at or beyond end, we're done, full
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* coverage */
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if (start >= end)
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return 1; /* we're done */
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}
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return 0;
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}
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/*
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* Find the highest page frame number we have available
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*/
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@ -80,6 +80,10 @@ static inline int bad_addr(unsigned long *addrp, unsigned long size)
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return 0;
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}
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/*
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* This function checks if any part of the range <start,end> is mapped
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* with type.
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*/
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int __meminit
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e820_any_mapped(unsigned long start, unsigned long end, unsigned type)
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{
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@ -95,6 +99,35 @@ e820_any_mapped(unsigned long start, unsigned long end, unsigned type)
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return 0;
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}
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/*
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* This function checks if the entire range <start,end> is mapped with type.
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*
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* Note: this function only works correct if the e820 table is sorted and
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* not-overlapping, which is the case
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*/
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int __init e820_all_mapped(unsigned long start, unsigned long end, unsigned type)
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{
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int i;
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for (i = 0; i < e820.nr_map; i++) {
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struct e820entry *ei = &e820.map[i];
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if (type && ei->type != type)
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continue;
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/* is the region (part) in overlap with the current region ?*/
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if (ei->addr >= end || ei->addr + ei->size <= start)
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continue;
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/* if the region is at the beginning of <start,end> we move
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* start to the end of the region since it's ok until there
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*/
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if (ei->addr <= start)
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start = ei->addr + ei->size;
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/* if start is now at or beyond end, we're done, full coverage */
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if (start >= end)
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return 1; /* we're done */
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}
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return 0;
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}
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/*
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* Find a free area in a specific range.
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*/
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@ -35,6 +35,10 @@ struct e820map {
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};
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extern struct e820map e820;
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extern int e820_all_mapped(unsigned long start, unsigned long end,
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unsigned type);
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#endif/*!__ASSEMBLY__*/
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#endif/*__E820_HEADER*/
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@ -48,6 +48,7 @@ extern unsigned long e820_end_of_ram(void);
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extern void e820_reserve_resources(void);
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extern void e820_print_map(char *who);
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extern int e820_any_mapped(unsigned long start, unsigned long end, unsigned type);
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extern int e820_all_mapped(unsigned long start, unsigned long end, unsigned type);
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extern void e820_bootmem_free(pg_data_t *pgdat, unsigned long start,unsigned long end);
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extern void e820_setup_gap(void);
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