mm/nohash/tlb_64e.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
7  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
27 #include <asm/text-patching.h>
32 /* The variables below are currently only used on 64-bit Book3E
45  * do not modify this SPRG in the TLB miss code; for other TLB miss handlers,
56 	int tsize = mmu_psize_defs[mmu_pte_psize].shift - 10;  in tlb_flush_pgtable()
68 			__flush_tlb_page(tlb->mm, start, tsize, 1);  in tlb_flush_pgtable()
76 		vpte = (vpte >> (PAGE_SHIFT - 3)) & ~0xffful;  in tlb_flush_pgtable()
78 		__flush_tlb_page(tlb->mm, vpte, tsize, 0);  in tlb_flush_pgtable()
102 			shift = def->shift;  in setup_page_sizes()
108 			shift = (shift - 10) >> 1;  in setup_page_sizes()
111 				def->flags |= MMU_PAGE_SIZE_DIRECT;  in setup_page_sizes()
139 			if (!def->shift)  in setup_page_sizes()
142 			if (tlb1ps & (1U << (def->shift - 10))) {  in setup_page_sizes()
143 				def->flags |= MMU_PAGE_SIZE_DIRECT;  in setup_page_sizes()
146 					def->flags |= MMU_PAGE_SIZE_INDIRECT;  in setup_page_sizes()
163 		if (def->flags == 0) {  in setup_page_sizes()
164 			def->shift = 0;  in setup_page_sizes()
167 		pr_info("  %8ld KB as %s\n", 1ul << (def->shift - 10),  in setup_page_sizes()
168 			__page_type_names[def->flags & 0x3]);  in setup_page_sizes()
173  * Early initialization of the MMU TLB code
200 	/* use a quarter of the TLBCAM for bolted linear map */  in early_init_this_mmu()
225 	 * Freescale booke only supports 4K pages in TLB0, so use that.  in early_init_mmu_global()
229 	/* XXX This code only checks for TLB 0 capabilities and doesn't  in early_init_mmu_global()
238 	 * If we want to use HW tablewalk, enable it by patching the TLB miss  in early_init_mmu_global()
253 	 * for use by the TLB miss code  in early_init_mmu_global()
267 	 * do this because highmem is not supported on 64-bit.  in early_mmu_set_memory_limit()
291 	 * On FSL Embedded 64-bit, usually all RAM is bolted, but with  in setup_initial_memory_limit()
292 	 * unusual memory sizes it's possible for some RAM to not be mapped  in setup_initial_memory_limit()
293 	 * (such RAM is not used at all by Linux, since we don't support  in setup_initial_memory_limit()
294 	 * highmem on 64-bit).  We limit ppc64_rma_size to what would be  in setup_initial_memory_limit()
298 	 * more.  This is due to what the early init code is set up to do.  in setup_initial_memory_limit()
306 	/* use a quarter of the TLBCAM for bolted linear map */  in setup_initial_memory_limit()