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/***********************license start***************
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* reserved.
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*
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*
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
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***********************license end**************************************/
/**
* @file
*
* cvmx-tlb supplies per core TLB access functions for simple executive
* applications.
*
* <hr>$Revision: 41586 $<hr>
*/
#include "cvmx.h"
#include "cvmx-tlb.h"
//#define DEBUG
/**
* @INTERNAL
* Convert page mask to string
*/
static inline const char* __mask_to_str(uint64_t mask)
{
/* Most OCTEON processor does not support 1K page sizes */
uint64_t non_1k_mask = mask + CVMX_TLB_PAGEMASK_4K;
switch (non_1k_mask) {
case CVMX_TLB_PAGEMASK_4K: return "4kb";
case CVMX_TLB_PAGEMASK_16K: return "16kb";
case CVMX_TLB_PAGEMASK_64K: return "64kb";
case CVMX_TLB_PAGEMASK_256K: return "256kb";
case CVMX_TLB_PAGEMASK_1M: return "1Mb";
case CVMX_TLB_PAGEMASK_4M: return "4Mb";
case CVMX_TLB_PAGEMASK_16M: return "16Mb";
case CVMX_TLB_PAGEMASK_64M: return "64Mb";
case CVMX_TLB_PAGEMASK_256M: return "256Mb";
}
return "";
}
/**
* @INTERNAL
* issue the tlb read instruction
*/
static inline void __tlb_read(void){
CVMX_EHB;
CVMX_TLBR;
CVMX_EHB;
}
/**
* @INTERNAL
* issue the tlb write instruction
*/
static inline void __tlb_write(void){
CVMX_EHB;
CVMX_TLBWI;
CVMX_EHB;
}
/**
* @INTERNAL
* issue the tlb read instruction
*/
static inline int __tlb_probe(uint64_t hi){
int index;
CVMX_EHB;
CVMX_MT_ENTRY_HIGH(hi);
CVMX_TLBP;
CVMX_EHB;
CVMX_MF_TLB_INDEX(index);
if (index < 0) index = -1;
return index;
}
/**
* @INTERNAL
* read a single tlb entry
*
* return 0: tlb entry is read
* -1: index is invalid
*/
static inline int __tlb_read_index(uint32_t tlbi){
if (tlbi >= cvmx_tlb_size_limit()) {
return -1;
}
CVMX_MT_TLB_INDEX(tlbi);
__tlb_read();
return 0;
}
/**
* @INTERNAL
* write a single tlb entry
*
* return 0: tlb entry is read
* -1: index is invalid
*/
static inline int __tlb_write_index(uint32_t tlbi,
uint64_t hi, uint64_t lo0,
uint64_t lo1, uint64_t pagemask)
{
if (tlbi >= cvmx_tlb_size_limit()) {
return -1;
}
#ifdef DEBUG
cvmx_dprintf("cvmx-tlb-dbg: "
"write TLB %d: hi %lx, lo0 %lx, lo1 %lx, pagemask %lx \n",
tlbi, hi, lo0, lo1, pagemask);
#endif
CVMX_MT_TLB_INDEX(tlbi);
CVMX_MT_ENTRY_HIGH(hi);
CVMX_MT_ENTRY_LO_0(lo0);
CVMX_MT_ENTRY_LO_1(lo1);
CVMX_MT_PAGEMASK(pagemask);
__tlb_write();
return 0;
}
/**
* @INTERNAL
* Determine if a TLB entry is free to use
*/
static inline int __tlb_entry_is_free(uint32_t tlbi) {
int ret = 0;
uint64_t lo0 = 0, lo1 = 0;
if (tlbi < cvmx_tlb_size_limit()) {
__tlb_read_index(tlbi);
/* Unused entries have neither even nor odd page mapped */
CVMX_MF_ENTRY_LO_0(lo0);
CVMX_MF_ENTRY_LO_1(lo1);
if ( !(lo0 & TLB_VALID) && !(lo1 & TLB_VALID)) {
ret = 1;
}
}
return ret;
}
/**
* @INTERNAL
* dump a single tlb entry
*/
static inline void __tlb_dump_index(uint32_t tlbi)
{
if (tlbi < cvmx_tlb_size_limit()) {
if (__tlb_entry_is_free(tlbi)) {
#ifdef DEBUG
cvmx_dprintf("Index: %3d Free \n", tlbi);
#endif
} else {
uint64_t lo0, lo1, pgmask;
uint32_t hi, c0, c1;
#ifdef DEBUG
int width = 13;
#endif
__tlb_read_index(tlbi);
CVMX_MF_ENTRY_HIGH(hi);
CVMX_MF_ENTRY_LO_0(lo0);
CVMX_MF_ENTRY_LO_1(lo1);
CVMX_MF_PAGEMASK(pgmask);
#ifdef DEBUG
cvmx_dprintf("Index: %3d pgmask=%s ", tlbi, __mask_to_str(pgmask));
#endif
c0 = ( lo0 >> 3 ) & 7;
c1 = ( lo1 >> 3 ) & 7;
#ifdef DEBUG
cvmx_dprintf("va=%0*lx asid=%02x\n",
width, (hi & ~0x1fffUL), hi & 0xff);
cvmx_dprintf("\t[pa=%0*lx c=%d d=%d v=%d g=%d] ",
width,
(lo0 << 6) & PAGE_MASK, c0,
(lo0 & 4) ? 1 : 0,
(lo0 & 2) ? 1 : 0,
(lo0 & 1) ? 1 : 0);
cvmx_dprintf("[pa=%0*lx c=%d d=%d v=%d g=%d]\n",
width,
(lo1 << 6) & PAGE_MASK, c1,
(lo1 & 4) ? 1 : 0,
(lo1 & 2) ? 1 : 0,
(lo1 & 1) ? 1 : 0);
#endif
}
}
}
/**
* @INTERNAL
* dump a single tlb entry
*/
static inline uint32_t __tlb_wired_index() {
uint32_t tlbi;
CVMX_MF_TLB_WIRED(tlbi);
return tlbi;
}
/**
* Set up a wired entry. This function is designed to be used by Simple
* Executive to set up its virtual to physical address mapping at start up
* time. After the mapping is set up, the remaining unused TLB entries can
* be use for run time shared memory mapping.
*
* Calling this function causes the C0 wired index register to increase.
* Wired index register points to the separation between fixed TLB mapping
* and run time shared memory mapping.
*
* @param hi Entry Hi
* @param lo0 Entry Low0
* @param lo1 Entry Low1
* @param pagemask Pagemask
*
* @return 0: the entry is added
* @return -1: out of TLB entry
*/
int cvmx_tlb_add_wired_entry( uint64_t hi, uint64_t lo0,
uint64_t lo1, uint64_t pagemask)
{
uint64_t index;
int ret = -1;
index = __tlb_wired_index();
/* Check to make sure if the index is free to use */
if (index < cvmx_tlb_size_limit() && __tlb_entry_is_free(index) ) {
/* increase the wired index by 1*/
__tlb_write_index(index, hi, lo0, lo1, pagemask);
CVMX_MT_TLB_WIRED(index + 1);
ret = 0;
}
return ret;
}
/**
* Find a free entry that can be used for share memory mapping.
*
* @return -1: no free entry found
* @return : a free entry
*/
int cvmx_tlb_allocate_runtime_entry(void)
{
uint32_t i, ret = -1;
for (i = __tlb_wired_index(); i< cvmx_tlb_size_limit(); i++) {
/* Check to make sure the index is free to use */
if (__tlb_entry_is_free(i)) {
/* Found and return */
ret = i;
break;
}
}
return ret;
}
/**
* Invalidate the TLB entry. Remove previous mapping if one was set up
*/
void cvmx_tlb_free_runtime_entry(uint32_t tlbi)
{
/* Invalidate an unwired TLB entry */
if ((tlbi < cvmx_tlb_size_limit()) && (tlbi >= __tlb_wired_index())) {
__tlb_write_index(tlbi, 0xffffffff80000000ULL, 0, 0, 0);
}
}
/**
* Program a single TLB entry to enable the provided vaddr to paddr mapping.
*
* @param index Index of the TLB entry
* @param vaddr The virtual address for this mapping
* @param paddr The physical address for this mapping
* @param size Size of the mapping
* @param tlb_flags Entry mapping flags
*/
void cvmx_tlb_write_entry(int index, uint64_t vaddr, uint64_t paddr,
uint64_t size, uint64_t tlb_flags) {
uint64_t lo0, lo1, hi, pagemask;
if ( __is_power_of_two(size) ) {
if ( (__log2(size) & 1 ) == 0) {
/* size is not power of 4, we only need to map
one page, figure out even or odd page to map */
if ((vaddr >> __log2(size) & 1)) {
lo0 = 0;
lo1 = ((paddr >> 12) << 6) | tlb_flags;
hi = ((vaddr - size) >> 12) << 12;
}else {
lo0 = ((paddr >> 12) << 6) | tlb_flags;
lo1 = 0;
hi = ((vaddr) >> 12) << 12;
}
pagemask = (size - 1) & (~1<<11);
}else {
lo0 = ((paddr >> 12)<< 6) | tlb_flags;
lo1 = (((paddr + size /2) >> 12) << 6) | tlb_flags;
hi = ((vaddr) >> 12) << 12;
pagemask = ((size/2) -1) & (~1<<11);
}
__tlb_write_index(index, hi, lo0, lo1, pagemask);
}
}
/**
* Program a single TLB entry to enable the provided vaddr to paddr mapping.
* This version adds a wired entry that should not be changed at run time
*
* @param vaddr The virtual address for this mapping
* @param paddr The physical address for this mapping
* @param size Size of the mapping
* @param tlb_flags Entry mapping flags
* @return -1: TLB out of entries
* 0: fixed entry added
*/
int cvmx_tlb_add_fixed_entry( uint64_t vaddr, uint64_t paddr, uint64_t size, uint64_t tlb_flags) {
uint64_t index;
int ret = 0;
CVMX_MF_TLB_WIRED(index);
/* Check to make sure if the index is free to use */
if (index < cvmx_tlb_size_limit() && __tlb_entry_is_free(index) ) {
cvmx_tlb_write_entry(index, vaddr, paddr, size, tlb_flags);
if (!__tlb_entry_is_free(index)) {
/* Bump up the wired register*/
CVMX_MT_TLB_WIRED(index + 1);
ret = 1;
}
}
return ret;
}
/**
* Program a single TLB entry to enable the provided vaddr to paddr mapping.
* This version writes a runtime entry. It will check the index to make sure
* not to overwrite any fixed entries.
*
* @param index Index of the TLB entry
* @param vaddr The virtual address for this mapping
* @param paddr The physical address for this mapping
* @param size Size of the mapping
* @param tlb_flags Entry mapping flags
*/
void cvmx_tlb_write_runtime_entry(int index, uint64_t vaddr, uint64_t paddr,
uint64_t size, uint64_t tlb_flags)
{
int wired_index;
CVMX_MF_TLB_WIRED(wired_index);
if (index >= wired_index) {
cvmx_tlb_write_entry(index, vaddr, paddr, size, tlb_flags);
}
}
/**
* Find the TLB index of a given virtual address
*
* @param vaddr The virtual address to look up
* @return -1 not TLB mapped
* >=0 TLB TLB index
*/
int cvmx_tlb_lookup(uint64_t vaddr) {
uint64_t hi= (vaddr >> 12 ) << 12; /* We always use ASID 0 */
return __tlb_probe(hi);
}
/**
* Debug routine to show all shared memory mapping
*/
void cvmx_tlb_dump_shared_mapping(void) {
uint32_t tlbi;
for ( tlbi = __tlb_wired_index(); tlbi<cvmx_tlb_size_limit(); tlbi++ ) {
__tlb_dump_index(tlbi);
}
}
/**
* Debug routine to show all TLB entries of this core
*
*/
void cvmx_tlb_dump_all(void) {
uint32_t tlbi;
for (tlbi = 0; tlbi<= cvmx_tlb_size_limit(); tlbi++ ) {
__tlb_dump_index(tlbi);
}
}