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sfence before writing satp, as well as after

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This commit is contained in:
Robert Morris 2022-08-24 13:24:24 -04:00
parent 96047832c6
commit 9c1b8a4eb0
3 changed files with 6 additions and 3 deletions
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2
kernel/fs.c
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@ -194,7 +194,7 @@ static struct inode* iget(uint dev, uint inum);
// Allocate an inode on device dev. // Allocate an inode on device dev.
// Mark it as allocated by giving it type type. // Mark it as allocated by giving it type type.
// Returns an unlocked but allocated and referenced inode, // Returns an unlocked but allocated and referenced inode,
// or NULL if there is no free inode.. // or NULL if there is no free inode.
struct inode* struct inode*
ialloc(uint dev, short type) ialloc(uint dev, short type)
{ {

2
kernel/trampoline.S
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@ -82,6 +82,7 @@ uservec:
# load the kernel page table, from p->trapframe->kernel_satp # load the kernel page table, from p->trapframe->kernel_satp
ld t1, 0(a0) ld t1, 0(a0)
sfence.vma zero, zero
csrw satp, t1 csrw satp, t1
sfence.vma zero, zero sfence.vma zero, zero
@ -96,6 +97,7 @@ userret:
# a0: user page table, for satp. # a0: user page table, for satp.
# switch to the user page table. # switch to the user page table.
sfence.vma zero, zero
csrw satp, a0 csrw satp, a0
sfence.vma zero, zero sfence.vma zero, zero

5
user/grind.c
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@ -305,7 +305,7 @@ iter()
exit(1); exit(1);
} }
if(pid1 == 0){ if(pid1 == 0){
rand_next = 31; rand_next ^= 31;
go(0); go(0);
exit(0); exit(0);
} }
@ -316,7 +316,7 @@ iter()
exit(1); exit(1);
} }
if(pid2 == 0){ if(pid2 == 0){
rand_next = 7177; rand_next ^= 7177;
go(1); go(1);
exit(0); exit(0);
} }
@ -346,5 +346,6 @@ main()
wait(0); wait(0);
} }
sleep(20); sleep(20);
rand_next += 1;
} }
} }