Anup Patel 8f3a2b4a96 RISC-V: Move DT mapping outof fixmap ... Currently, RISC-V reserves 1MB of fixmap memory for device tree. However, it maps only single PMD (2MB) space for fixmap which leaves only < 1MB space left for other kernel features such as early ioremap which requires fixmap as well. The fixmap size can be increased by another 2MB but it brings additional complexity and changes the virtual memory layout as well. If we require some additional feature requiring fixmap again, it has to be moved again. Technically, DT doesn't need a fixmap as the memory occupied by the DT is only used during boot. That's why, We map device tree in early page table using two consecutive PGD mappings at lower addresses (< PAGE_OFFSET). This frees lot of space in fixmap and also makes maximum supported device tree size supported as PGDIR_SIZE. Thus, init memory section can be used for the same purpose as well. This simplifies fixmap implementation. Signed-off-by: Anup Patel <anup.patel@wdc.com> Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>		2020-10-02 14:30:57 -07:00
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cacheflush.c	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
context.c	riscv: add nommu support	2019-11-17 15:17:39 -08:00
extable.c	riscv: abstract out CSR names for supervisor vs machine mode	2019-11-05 09:20:42 -08:00
fault.c	riscv/mm/fault: Set FAULT_FLAG_INSTRUCTION flag in do_page_fault()	2020-09-15 18:46:11 -07:00
hugetlbpage.c	hugetlbfs: remove hugetlb_add_hstate() warning for existing hstate	2020-06-03 20:09:46 -07:00
init.c	RISC-V: Move DT mapping outof fixmap	2020-10-02 14:30:57 -07:00
kasan_init.c	riscv: kasan: use local_tlb_flush_all() to avoid uninitialized __sbi_rfence	2020-07-20 21:14:51 -07:00
Makefile	riscv: Allow building with kcov coverage	2020-07-30 11:37:35 -07:00
pageattr.c	riscv: fix build warning of mm/pageattr	2020-07-30 11:37:50 -07:00
physaddr.c	riscv: mm: add support for CONFIG_DEBUG_VIRTUAL	2020-01-23 10:40:06 -08:00
ptdump.c	mm: introduce include/linux/pgtable.h	2020-06-09 09:39:13 -07:00
tlbflush.c	RISC-V: Issue a tlb page flush if possible	2019-10-29 11:32:18 -07:00