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arch/risc-v: Add method to extract PPN from SATP value

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This makes it possible to get the physical page number (PPN) from any
SATP value, not only the currently active SATP register.
This commit is contained in:
Ville Juven 2023-05-23 16:40:01 +03:00 committed by Xiang Xiao
parent 376874d88b
commit 1387c35213
1 changed files with 21 additions and 5 deletions
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26
arch/risc-v/src/common/riscv_mmu.h
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@ -307,11 +307,30 @@ static inline uintptr_t mmu_pte_to_paddr(uintptr_t pte)
return paddr;
}
/****************************************************************************
* Name: mmu_satp_to_paddr
*
* Description:
* Extract physical address from SATP
*
* Returned Value:
* Physical address from SATP value
*
****************************************************************************/
static inline uintptr_t mmu_satp_to_paddr(uintptr_t satp)
{
uintptr_t ppn;
ppn = satp;
ppn = ((ppn >> SATP_PPN_SHIFT) & SATP_PPN_MASK);
return SATP_PPN_TO_ADDR(ppn);
}
/****************************************************************************
* Name: mmu_get_satp_pgbase
*
* Description:
* Utility function to read the base page table physical address
* Utility function to read the current base page table physical address
*
* Returned Value:
* Physical address of the current base page table
@ -320,10 +339,7 @@ static inline uintptr_t mmu_pte_to_paddr(uintptr_t pte)
static inline uintptr_t mmu_get_satp_pgbase(void)
{
uintptr_t ppn;
ppn = mmu_read_satp();
ppn = ((ppn >> SATP_PPN_SHIFT) & SATP_PPN_MASK);
return SATP_PPN_TO_ADDR(ppn);
return mmu_satp_to_paddr(mmu_read_satp());
}
/****************************************************************************