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lib: Implement sfence.vma correctly.

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Currently, OpenSBI doesn't distinguish between sfence.vma
and sfence.vm asid calls. Moreover, it ignores the page
ranges and just flush entire TLB everytime.

Fix the sfence implementation by keeping all the tlb flush
info in scratch area.

The relevant Linux kernel code was added by
https://patchwork.kernel.org/project/linux-riscv/list/?series=89695

However, this patch is backward compatible with older version kernel
that doesn't have the above patches as well.

Fixes #87
Signed-off-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Atish Patra 2019-03-09 12:57:20 -08:00 • committed by Anup Patel
parent 508a27204c
commit 90cb4917b5
6 changed files with 106 additions and 16 deletions
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5
include/sbi/riscv_asm.h
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@ -26,6 +26,11 @@
#error "Unexpected __riscv_xlen"
#endif
#define PAGE_SHIFT (12)
#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE - 1))
#define SBI_TLB_FLUSH_ALL ((unsigned long)-1)
#define REG_L __REG_SEL(ld, lw)
#define REG_S __REG_SEL(sd, sw)
#define SZREG __REG_SEL(8, 4)