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riscv: Minor cleanup in startup code

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- remove setting of register value which is not used until the next value is
   set
 - Use the L2_SHIFT constant when setting up L2 superpages

Submitted by:	Antonin Houska <ah AT melesmeles DOT cz>
This commit is contained in:
Kristof Provost 2020-10-27 12:44:49 +00:00
parent f8ae041a04
commit eb81dfb3af
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=367078
1 changed files with 1 additions and 2 deletions
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3
sys/riscv/riscv/locore.S
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@ -135,10 +135,9 @@ pagetables:
/* Level 2 superpages (512 x 2MiB) */
lla s1, pagetable_l2
srli t4, s9, 21 /* Div physmem base by 2 MiB */
srli t4, s9, L2_SHIFT /* Div physmem base by 2 MiB */
li t2, 512 /* Build 512 entries */
add t3, t4, t2
li t5, 0
li t0, (PTE_KERN | PTE_X)
1:
slli t2, t4, PTE_PPN1_S /* << PTE_PPN1_S */