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microwatt/tests/mmu/mmu.c

469 lines
10 KiB
C

#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include "console.h"
extern int test_read(long *addr, long *ret, long init);
extern int test_write(long *addr, long val);
static inline void do_tlbie(unsigned long rb, unsigned long rs)
{
__asm__ volatile("tlbie %0,%1" : : "r" (rb), "r" (rs) : "memory");
}
static inline unsigned long mfspr(int sprnum)
{
long val;
__asm__ volatile("mfspr %0,%1" : "=r" (val) : "i" (sprnum));
return val;
}
static inline void mtspr(int sprnum, unsigned long val)
{
__asm__ volatile("mtspr %0,%1" : : "i" (sprnum), "r" (val));
}
static inline void store_pte(unsigned long *p, unsigned long pte)
{
__asm__ volatile("stdbrx %1,0,%0" : : "r" (p), "r" (pte) : "memory");
}
void print_string(const char *str)
{
for (; *str; ++str)
putchar(*str);
}
void print_hex(unsigned long val)
{
int i, x;
for (i = 60; i >= 0; i -= 4) {
x = (val >> i) & 0xf;
if (x >= 10)
putchar(x + 'a' - 10);
else
putchar(x + '0');
}
}
// i < 100
void print_test_number(int i)
{
print_string("test ");
putchar(48 + i/10);
putchar(48 + i%10);
putchar(':');
}
#define CACHE_LINE_SIZE 64
void zero_memory(void *ptr, unsigned long nbytes)
{
unsigned long nb, i, nl;
void *p;
for (; nbytes != 0; nbytes -= nb, ptr += nb) {
nb = -((unsigned long)ptr) & (CACHE_LINE_SIZE - 1);
if (nb == 0 && nbytes >= CACHE_LINE_SIZE) {
nl = nbytes / CACHE_LINE_SIZE;
p = ptr;
for (i = 0; i < nl; ++i) {
__asm__ volatile("dcbz 0,%0" : : "r" (p) : "memory");
p += CACHE_LINE_SIZE;
}
nb = nl * CACHE_LINE_SIZE;
} else {
if (nb > nbytes)
nb = nbytes;
for (i = 0; i < nb; ++i)
((unsigned char *)ptr)[i] = 0;
}
}
}
#define PERM_EX 0x001
#define PERM_WR 0x002
#define PERM_RD 0x004
#define PERM_PRIV 0x008
#define ATTR_NC 0x020
#define CHG 0x080
#define REF 0x100
#define DFLT_PERM (PERM_WR | PERM_RD | REF | CHG)
/*
* Set up an MMU translation tree using memory starting at the 64k point.
* We use 2 levels, mapping 2GB (the minimum size possible), with a
* 8kB PGD level pointing to 4kB PTE pages.
*/
unsigned long *pgdir = (unsigned long *) 0x10000;
unsigned long free_ptr = 0x12000;
void *eas_mapped[4];
int neas_mapped;
void init_mmu(void)
{
zero_memory(pgdir, 1024 * sizeof(unsigned long));
/* RTS = 0 (2GB address space), RPDS = 10 (1024-entry top level) */
mtspr(720, (unsigned long) pgdir | 10);
do_tlbie(0xc00, 0); /* invalidate all TLB entries */
}
static unsigned long *read_pgd(unsigned long i)
{
unsigned long ret;
__asm__ volatile("ldbrx %0,%1,%2" : "=r" (ret) : "b" (pgdir),
"r" (i * sizeof(unsigned long)));
return (unsigned long *) (ret & 0x00ffffffffffff00);
}
void map(void *ea, void *pa, unsigned long perm_attr)
{
unsigned long epn = (unsigned long) ea >> 12;
unsigned long i, j;
unsigned long *ptep;
i = (epn >> 9) & 0x3ff;
j = epn & 0x1ff;
if (pgdir[i] == 0) {
zero_memory((void *)free_ptr, 512 * sizeof(unsigned long));
store_pte(&pgdir[i], 0x8000000000000000 | free_ptr | 9);
free_ptr += 512 * sizeof(unsigned long);
}
ptep = read_pgd(i);
store_pte(&ptep[j], 0xc000000000000000 | ((unsigned long)pa & 0x00fffffffffff000) | perm_attr);
eas_mapped[neas_mapped++] = ea;
}
void unmap(void *ea)
{
unsigned long epn = (unsigned long) ea >> 12;
unsigned long i, j;
unsigned long *ptep;
i = (epn >> 9) & 0x3ff;
j = epn & 0x1ff;
if (pgdir[i] == 0)
return;
ptep = read_pgd(i);
ptep[j] = 0;
do_tlbie(((unsigned long)ea & ~0xfff), 0);
}
void unmap_all(void)
{
int i;
for (i = 0; i < neas_mapped; ++i)
unmap(eas_mapped[i]);
neas_mapped = 0;
}
int mmu_test_1(void)
{
long *ptr = (long *) 0x123000;
long val;
/* this should fail */
if (test_read(ptr, &val, 0xdeadbeefd00d))
return 1;
/* dest reg of load should be unchanged */
if (val != 0xdeadbeefd00d)
return 2;
/* DAR and DSISR should be set correctly */
if (mfspr(19) != (long) ptr || mfspr(18) != 0x40000000)
return 3;
return 0;
}
int mmu_test_2(void)
{
long *mem = (long *) 0x4000;
long *ptr = (long *) 0x124000;
long *ptr2 = (long *) 0x1124000;
long val;
/* create PTE */
map(ptr, mem, DFLT_PERM);
/* initialize the memory content */
mem[33] = 0xbadc0ffee;
/* this should succeed and be a cache miss */
if (!test_read(&ptr[33], &val, 0xdeadbeefd00d))
return 1;
/* dest reg of load should have the value written */
if (val != 0xbadc0ffee)
return 2;
/* load a second TLB entry in the same set as the first */
map(ptr2, mem, DFLT_PERM);
/* this should succeed and be a cache hit */
if (!test_read(&ptr2[33], &val, 0xdeadbeefd00d))
return 3;
/* dest reg of load should have the value written */
if (val != 0xbadc0ffee)
return 4;
/* check that the first entry still works */
if (!test_read(&ptr[33], &val, 0xdeadbeefd00d))
return 5;
if (val != 0xbadc0ffee)
return 6;
return 0;
}
int mmu_test_3(void)
{
long *mem = (long *) 0x5000;
long *ptr = (long *) 0x149000;
long val;
/* create PTE */
map(ptr, mem, DFLT_PERM);
/* initialize the memory content */
mem[45] = 0xfee1800d4ea;
/* this should succeed and be a cache miss */
if (!test_read(&ptr[45], &val, 0xdeadbeefd0d0))
return 1;
/* dest reg of load should have the value written */
if (val != 0xfee1800d4ea)
return 2;
/* remove the PTE */
unmap(ptr);
/* this should fail */
if (test_read(&ptr[45], &val, 0xdeadbeefd0d0))
return 3;
/* dest reg of load should be unchanged */
if (val != 0xdeadbeefd0d0)
return 4;
/* DAR and DSISR should be set correctly */
if (mfspr(19) != (long) &ptr[45] || mfspr(18) != 0x40000000)
return 5;
return 0;
}
int mmu_test_4(void)
{
long *mem = (long *) 0x6000;
long *ptr = (long *) 0x10a000;
long *ptr2 = (long *) 0x110a000;
long val;
/* create PTE */
map(ptr, mem, DFLT_PERM);
/* initialize the memory content */
mem[27] = 0xf00f00f00f00;
/* this should succeed and be a cache miss */
if (!test_write(&ptr[27], 0xe44badc0ffee))
return 1;
/* memory should now have the value written */
if (mem[27] != 0xe44badc0ffee)
return 2;
/* load a second TLB entry in the same set as the first */
map(ptr2, mem, DFLT_PERM);
/* this should succeed and be a cache hit */
if (!test_write(&ptr2[27], 0x6e11ae))
return 3;
/* memory should have the value written */
if (mem[27] != 0x6e11ae)
return 4;
/* check that the first entry still exists */
/* (assumes TLB is 2-way associative or more) */
if (!test_read(&ptr[27], &val, 0xdeadbeefd00d))
return 5;
if (val != 0x6e11ae)
return 6;
return 0;
}
int mmu_test_5(void)
{
long *mem = (long *) 0x7ffd;
long *ptr = (long *) 0x39fffd;
long val;
/* create PTE */
map(ptr, mem, DFLT_PERM);
/* this should fail */
if (test_read(ptr, &val, 0xdeadbeef0dd0))
return 1;
/* dest reg of load should be unchanged */
if (val != 0xdeadbeef0dd0)
return 2;
/* DAR and DSISR should be set correctly */
if (mfspr(19) != ((long)ptr & ~0xfff) + 0x1000 || mfspr(18) != 0x40000000)
return 3;
return 0;
}
int mmu_test_6(void)
{
long *mem = (long *) 0x7ffd;
long *ptr = (long *) 0x39fffd;
/* create PTE */
map(ptr, mem, DFLT_PERM);
/* initialize memory */
*mem = 0x123456789abcdef0;
/* this should fail */
if (test_write(ptr, 0xdeadbeef0dd0))
return 1;
/* DAR and DSISR should be set correctly */
if (mfspr(19) != ((long)ptr & ~0xfff) + 0x1000 || mfspr(18) != 0x42000000)
return 2;
return 0;
}
int mmu_test_7(void)
{
long *mem = (long *) 0x4000;
long *ptr = (long *) 0x124000;
long val;
*mem = 0x123456789abcdef0;
/* create PTE without R or C */
map(ptr, mem, PERM_RD | PERM_WR);
/* this should fail */
if (test_read(ptr, &val, 0xdeadd00dbeef))
return 1;
/* dest reg of load should be unchanged */
if (val != 0xdeadd00dbeef)
return 2;
/* DAR and DSISR should be set correctly */
if (mfspr(19) != (long) ptr || mfspr(18) != 0x00040000)
return 3;
/* this should fail */
if (test_write(ptr, 0xdeadbeef0dd0))
return 4;
/* DAR and DSISR should be set correctly */
if (mfspr(19) != (long)ptr || mfspr(18) != 0x02040000)
return 5;
/* memory should be unchanged */
if (*mem != 0x123456789abcdef0)
return 6;
return 0;
}
int mmu_test_8(void)
{
long *mem = (long *) 0x4000;
long *ptr = (long *) 0x124000;
long val;
*mem = 0x123456789abcdef0;
/* create PTE with R but not C */
map(ptr, mem, REF | PERM_RD | PERM_WR);
/* this should succeed */
if (!test_read(ptr, &val, 0xdeadd00dbeef))
return 1;
/* this should fail */
if (test_write(ptr, 0xdeadbeef0dd1))
return 2;
/* DAR and DSISR should be set correctly */
if (mfspr(19) != (long)ptr || mfspr(18) != 0x02040000)
return 3;
/* memory should be unchanged */
if (*mem != 0x123456789abcdef0)
return 4;
return 0;
}
int mmu_test_9(void)
{
long *mem = (long *) 0x4000;
long *ptr = (long *) 0x124000;
long val;
*mem = 0x123456789abcdef0;
/* create PTE without read or write permission */
map(ptr, mem, REF);
/* this should fail */
if (test_read(ptr, &val, 0xdeadd00dbeef))
return 1;
/* dest reg of load should be unchanged */
if (val != 0xdeadd00dbeef)
return 2;
/* DAR and DSISR should be set correctly */
if (mfspr(19) != (long) ptr || mfspr(18) != 0x08000000)
return 3;
/* this should fail */
if (test_write(ptr, 0xdeadbeef0dd1))
return 4;
/* DAR and DSISR should be set correctly */
if (mfspr(19) != (long)ptr || mfspr(18) != 0x0a000000)
return 5;
/* memory should be unchanged */
if (*mem != 0x123456789abcdef0)
return 6;
return 0;
}
int mmu_test_10(void)
{
long *mem = (long *) 0x4000;
long *ptr = (long *) 0x124000;
long val;
*mem = 0x123456789abcdef0;
/* create PTE with read but not write permission */
map(ptr, mem, REF | PERM_RD);
/* this should succeed */
if (!test_read(ptr, &val, 0xdeadd00dbeef))
return 1;
/* this should fail */
if (test_write(ptr, 0xdeadbeef0dd1))
return 2;
/* DAR and DSISR should be set correctly */
if (mfspr(19) != (long)ptr || mfspr(18) != 0x0a000000)
return 3;
/* memory should be unchanged */
if (*mem != 0x123456789abcdef0)
return 4;
return 0;
}
int fail = 0;
void do_test(int num, int (*test)(void))
{
int ret;
mtspr(18, 0);
mtspr(19, 0);
unmap_all();
print_test_number(num);
ret = test();
if (ret == 0) {
print_string("PASS\r\n");
} else {
fail = 1;
print_string("FAIL ");
putchar(ret + '0');
print_string(" DAR=");
print_hex(mfspr(19));
print_string(" DSISR=");
print_hex(mfspr(18));
print_string("\r\n");
}
}
int main(void)
{
potato_uart_init();
init_mmu();
do_test(1, mmu_test_1);
do_test(2, mmu_test_2);
do_test(3, mmu_test_3);
do_test(4, mmu_test_4);
do_test(5, mmu_test_5);
do_test(6, mmu_test_6);
do_test(7, mmu_test_7);
do_test(8, mmu_test_8);
do_test(9, mmu_test_9);
do_test(10, mmu_test_10);
return fail;
}