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riscv: rename sptbr to satp

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satp is the name used by the current privileged spec 1.10, use it
instead of the old name.  The most recent release binutils release
(2.29) doesn't know about the satp name yet, so stick to the name from
the previous privileged ISA release and comment on the fact.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Christoph Hellwig 2018-01-09 15:00:32 +01:00 committed by Palmer Dabbelt
parent 372def1f93
commit 7549cdf59d
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GPG Key ID: EF4CA1502CCBAB41
4 changed files with 20 additions and 11 deletions
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14
arch/riscv/include/asm/csr.h
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@ -40,15 +40,15 @@
#define SR_SD _AC(0x8000000000000000, UL) /* FS/XS dirty */
#endif
/* SPTBR flags */
/* SATP flags */
#if __riscv_xlen == 32
#define SPTBR_PPN _AC(0x003FFFFF, UL)
#define SPTBR_MODE_32 _AC(0x80000000, UL)
#define SPTBR_MODE SPTBR_MODE_32
#define SATP_PPN _AC(0x003FFFFF, UL)
#define SATP_MODE_32 _AC(0x80000000, UL)
#define SATP_MODE SATP_MODE_32
#else
#define SPTBR_PPN _AC(0x00000FFFFFFFFFFF, UL)
#define SPTBR_MODE_39 _AC(0x8000000000000000, UL)
#define SPTBR_MODE SPTBR_MODE_39
#define SATP_PPN _AC(0x00000FFFFFFFFFFF, UL)
#define SATP_MODE_39 _AC(0x8000000000000000, UL)
#define SATP_MODE SATP_MODE_39
#endif
/* Interrupt Enable and Interrupt Pending flags */

7
arch/riscv/include/asm/mmu_context.h
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@ -41,7 +41,12 @@ static inline void destroy_context(struct mm_struct *mm)
static inline void set_pgdir(pgd_t *pgd)
{
csr_write(sptbr, virt_to_pfn(pgd) | SPTBR_MODE);
/*
* Use the old spbtr name instead of using the current satp
* name to support binutils 2.29 which doesn't know about the
* privileged ISA 1.10 yet.
*/
csr_write(sptbr, virt_to_pfn(next->pgd) | SATP_MODE);
}
/*

6
arch/riscv/kernel/head.S
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@ -74,15 +74,15 @@ relocate:
sub a1, a1, a0
add ra, ra, a1
/* Point stvec to virtual address of intruction after sptbr write */
/* Point stvec to virtual address of intruction after satp write */
la a0, 1f
add a0, a0, a1
csrw stvec, a0
/* Compute sptbr for kernel page tables, but don't load it yet */
/* Compute satp for kernel page tables, but don't load it yet */
la a2, swapper_pg_dir
srl a2, a2, PAGE_SHIFT
li a1, SPTBR_MODE
li a1, SATP_MODE
or a2, a2, a1
/*

4
arch/riscv/mm/fault.c
View File

@ -239,6 +239,10 @@ vmalloc_fault:
* Do _not_ use "tsk->active_mm->pgd" here.
* We might be inside an interrupt in the middle
* of a task switch.
*
* Note: Use the old spbtr name instead of using the current
* satp name to support binutils 2.29 which doesn't know about
* the privileged ISA 1.10 yet.
*/
index = pgd_index(addr);
pgd = (pgd_t *)pfn_to_virt(csr_read(sptbr)) + index;