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10可用积分
pgt_buf_end/pgt_buf_start/pgt_buf_top 维护的这部分空间有何用途,直接使用memblock分配,不行么?
请教,谢谢~
- 124 /* need 3 4k for initial PMD_SIZE, 3 4k for 0-ISA_END_ADDRESS */
- 125 #define INIT_PGT_BUF_SIZE (6 * PAGE_SIZE)
- 126 RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE);
- 127 void __init early_alloc_pgt_buf(void)
- 128 {
- 129 unsigned long tables = INIT_PGT_BUF_SIZE;
- 130 phys_addr_t base;
- 131
- 132 base = __pa(extend_brk(tables, PAGE_SIZE));
- 133
- 134 pgt_buf_start = base >> PAGE_SHIFT;
- 135 pgt_buf_end = pgt_buf_start;
- 136 pgt_buf_top = pgt_buf_start + (tables >> PAGE_SHIFT);
- 137 }
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