struct mips_ejtag *ejtag_info;
};
-static int mips32_pracc_sync_cache(struct mips_ejtag *ejtag_info,
- uint32_t start_addr, uint32_t end_addr);
-static int mips32_pracc_clean_invalidate_cache(struct mips_ejtag *ejtag_info,
- uint32_t start_addr, uint32_t end_addr);
-
static int wait_for_pracc_rw(struct mips_ejtag *ejtag_info, uint32_t *ctrl)
{
uint32_t ejtag_ctrl;
* to write back any containing D-cache line and invalidate any locations
* already in the I-cache.
*
- * You can do that with cache instructions, but those instructions are only available in kernel mode,
- * and a loader writing instructions for the use of its own process need not be privileged software.
+ * If the cache coherency attribute (CCA) is set to zero, it's a write through cache, there is no need
+ * to write back.
*
* In the latest MIPS32/64 CPUs, MIPS provides the synci instruction,
* which does the whole job for a cache-line-sized chunk of the memory you just loaded:
- * That is, it arranges a D-cache write-back and an I-cache invalidate.
+ * That is, it arranges a D-cache write-back (if CCA = 3) and an I-cache invalidate.
*
- * To employ synci at user level, you need to know the size of a cache line,
- * and that can be obtained with a rdhwr SYNCI_Step
- * from one of the standard “hardware registers”.
+ * The line size is obtained with the rdhwr SYNCI_Step in release 2 or from cp0 config 1 register in release 1.
*/
-static int mips32_pracc_sync_cache(struct mips_ejtag *ejtag_info,
- uint32_t start_addr, uint32_t end_addr)
+static int mips32_pracc_synchronize_cache(struct mips_ejtag *ejtag_info,
+ uint32_t start_addr, uint32_t end_addr, int cached, int rel)
{
- static const uint32_t code[] = {
- /* start: */
- MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
- MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
- MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
- MIPS32_SW(8, 0, 15), /* sw $8,($15) */
- MIPS32_SW(9, 0, 15), /* sw $9,($15) */
- MIPS32_SW(10, 0, 15), /* sw $10,($15) */
- MIPS32_SW(11, 0, 15), /* sw $11,($15) */
-
- MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $8 = MIPS32_PRACC_PARAM_IN */
- MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
- MIPS32_LW(9, 0, 8), /* Load write start_addr to $9 */
- MIPS32_LW(10, 4, 8), /* Load write end_addr to $10 */
-
- MIPS32_RDHWR(11, MIPS32_SYNCI_STEP), /* $11 = MIPS32_SYNCI_STEP */
- MIPS32_BEQ(11, 0, 6), /* beq $11, $0, end */
- MIPS32_NOP,
- /* synci_loop : */
- MIPS32_SYNCI(0, 9), /* synci 0($9) */
- MIPS32_SLTU(8, 10, 9), /* sltu $8, $10, $9 # $8 = $10 < $9 ? 1 : 0 */
- MIPS32_BNE(8, 0, NEG16(3)), /* bne $8, $0, synci_loop */
- MIPS32_ADDU(9, 9, 11), /* $9 += MIPS32_SYNCI_STEP */
- MIPS32_SYNC,
- /* end: */
- MIPS32_LW(11, 0, 15), /* lw $11,($15) */
- MIPS32_LW(10, 0, 15), /* lw $10,($15) */
- MIPS32_LW(9, 0, 15), /* lw $9,($15) */
- MIPS32_LW(8, 0, 15), /* lw $8,($15) */
- MIPS32_B(NEG16(24)), /* b start */
- MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
- };
+ struct pracc_queue_info ctx = {.max_code = 256 * 2 + 6};
+ pracc_queue_init(&ctx);
+ if (ctx.retval != ERROR_OK)
+ goto exit;
+ /** Find cache line size in bytes */
+ uint32_t clsiz;
+ if (rel) { /* Release 2 (rel = 1) */
+ pracc_add(&ctx, 0, MIPS32_MTC0(15, 31, 0)); /* move $15 to COP0 DeSave */
+ pracc_add(&ctx, 0, MIPS32_LUI(15, PRACC_UPPER_BASE_ADDR)); /* $15 = MIPS32_PRACC_BASE_ADDR */
- /* TODO remove array */
- uint32_t *param_in = malloc(2 * sizeof(uint32_t));
- int retval;
- param_in[0] = start_addr;
- param_in[1] = end_addr;
+ pracc_add(&ctx, 0, MIPS32_RDHWR(8, MIPS32_SYNCI_STEP)); /* load synci_step value to $8 */
- retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 2, param_in, 0, NULL, 1);
+ pracc_add(&ctx, MIPS32_PRACC_PARAM_OUT,
+ MIPS32_SW(8, PRACC_OUT_OFFSET, 15)); /* store $8 to pracc_out */
- free(param_in);
+ pracc_add(&ctx, 0, MIPS32_LUI(8, UPPER16(ejtag_info->reg8))); /* restore upper 16 bits of $8 */
+ pracc_add(&ctx, 0, MIPS32_ORI(8, 8, LOWER16(ejtag_info->reg8))); /* restore lower 16 bits of $8 */
+ pracc_add(&ctx, 0, MIPS32_B(NEG16(ctx.code_count + 1))); /* jump to start */
+ pracc_add(&ctx, 0, MIPS32_MFC0(15, 31, 0)); /* move COP0 DeSave to $15 */
- return retval;
-}
+ ctx.retval = mips32_pracc_queue_exec(ejtag_info, &ctx, &clsiz);
+ if (ctx.retval != ERROR_OK)
+ goto exit;
-/**
- * \b mips32_pracc_clean_invalidate_cache
- *
- * Writeback D$ and Invalidate I$
- * so that the instructions written can be visible to CPU
- */
-static int mips32_pracc_clean_invalidate_cache(struct mips_ejtag *ejtag_info,
- uint32_t start_addr, uint32_t end_addr)
-{
- static const uint32_t code[] = {
- /* start: */
- MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
- MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
- MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
- MIPS32_SW(8, 0, 15), /* sw $8,($15) */
- MIPS32_SW(9, 0, 15), /* sw $9,($15) */
- MIPS32_SW(10, 0, 15), /* sw $10,($15) */
- MIPS32_SW(11, 0, 15), /* sw $11,($15) */
-
- MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $8 = MIPS32_PRACC_PARAM_IN */
- MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
- MIPS32_LW(9, 0, 8), /* Load write start_addr to $9 */
- MIPS32_LW(10, 4, 8), /* Load write end_addr to $10 */
- MIPS32_LW(11, 8, 8), /* Load write clsiz to $11 */
-
- /* cache_loop: */
- MIPS32_SLTU(8, 10, 9), /* sltu $8, $10, $9 : $8 <- $10 < $9 ? */
- MIPS32_BGTZ(8, 6), /* bgtz $8, end */
- MIPS32_NOP,
+ } else { /* Release 1 (rel = 0) */
+ uint32_t conf;
+ ctx.retval = mips32_cp0_read(ejtag_info, &conf, 16, 1);
+ if (ctx.retval != ERROR_OK)
+ goto exit;
- MIPS32_CACHE(MIPS32_CACHE_D_HIT_WRITEBACK, 0, 9), /* cache Hit_Writeback_D, 0($9) */
- MIPS32_CACHE(MIPS32_CACHE_I_HIT_INVALIDATE, 0, 9), /* cache Hit_Invalidate_I, 0($9) */
+ uint32_t dl = (conf & MIPS32_CONFIG1_DL_MASK) >> MIPS32_CONFIG1_DL_SHIFT;
- MIPS32_ADDU(9, 9, 11), /* $9 += $11 */
+ /* dl encoding : dl=1 => 4 bytes, dl=2 => 8 bytes, etc... max dl=6 => 128 bytes cache line size */
+ clsiz = 0x2 << dl;
+ if (dl == 0)
+ clsiz = 0;
+ }
- MIPS32_B(NEG16(7)), /* b cache_loop */
- MIPS32_NOP,
- /* end: */
- MIPS32_LW(11, 0, 15), /* lw $11,($15) */
- MIPS32_LW(10, 0, 15), /* lw $10,($15) */
- MIPS32_LW(9, 0, 15), /* lw $9,($15) */
- MIPS32_LW(8, 0, 15), /* lw $8,($15) */
- MIPS32_B(NEG16(25)), /* b start */
- MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
- };
+ if (clsiz == 0)
+ goto exit; /* Nothing to do */
- /**
- * Find cache line size in bytes
- */
- uint32_t conf;
- uint32_t dl, clsiz;
+ /* make sure clsiz is power of 2 */
+ if (clsiz & (clsiz - 1)) {
+ LOG_DEBUG("clsiz must be power of 2");
+ ctx.retval = ERROR_FAIL;
+ goto exit;
+ }
- mips32_cp0_read(ejtag_info, &conf, 16, 1);
- dl = (conf & MIPS32_CONFIG1_DL_MASK) >> MIPS32_CONFIG1_DL_SHIFT;
+ /* make sure start_addr and end_addr have the same offset inside de cache line */
+ start_addr |= clsiz - 1;
+ end_addr |= clsiz - 1;
- /* dl encoding : dl=1 => 4 bytes, dl=2 => 8 bytes, etc... */
- clsiz = 0x2 << dl;
+ ctx.code_count = 0;
+ int count = 0;
+ uint32_t last_upper_base_addr = UPPER16((start_addr + 0x8000));
- /* TODO remove array */
- uint32_t *param_in = malloc(3 * sizeof(uint32_t));
- int retval;
- param_in[0] = start_addr;
- param_in[1] = end_addr;
- param_in[2] = clsiz;
+ pracc_add(&ctx, 0, MIPS32_MTC0(15, 31, 0)); /* move $15 to COP0 DeSave */
+ pracc_add(&ctx, 0, MIPS32_LUI(15, last_upper_base_addr)); /* load upper memory base address to $15 */
+
+ while (start_addr <= end_addr) { /* main loop */
+ uint32_t upper_base_addr = UPPER16((start_addr + 0x8000));
+ if (last_upper_base_addr != upper_base_addr) { /* if needed, change upper address in $15 */
+ pracc_add(&ctx, 0, MIPS32_LUI(15, upper_base_addr));
+ last_upper_base_addr = upper_base_addr;
+ }
+ if (rel)
+ pracc_add(&ctx, 0, MIPS32_SYNCI(LOWER16(start_addr), 15)); /* synci instruction, offset($15) */
- retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 3, param_in, 0, NULL, 1);
+ else {
+ if (cached == 3)
+ pracc_add(&ctx, 0, MIPS32_CACHE(MIPS32_CACHE_D_HIT_WRITEBACK,
+ LOWER16(start_addr), 15)); /* cache Hit_Writeback_D, offset($15) */
- free(param_in);
+ pracc_add(&ctx, 0, MIPS32_CACHE(MIPS32_CACHE_I_HIT_INVALIDATE,
+ LOWER16(start_addr), 15)); /* cache Hit_Invalidate_I, offset($15) */
+ }
+ start_addr += clsiz;
+ count++;
+ if (count == 256 && start_addr <= end_addr) { /* more ?, then execute code list */
+ pracc_add(&ctx, 0, MIPS32_B(NEG16(ctx.code_count + 1))); /* jump to start */
+ pracc_add(&ctx, 0, MIPS32_NOP); /* nop in delay slot */
- return retval;
+ ctx.retval = mips32_pracc_queue_exec(ejtag_info, &ctx, NULL);
+ if (ctx.retval != ERROR_OK)
+ goto exit;
+
+ ctx.code_count = 0;
+ count = 0;
+ }
+ }
+ pracc_add(&ctx, 0, MIPS32_SYNC);
+ pracc_add(&ctx, 0, MIPS32_B(NEG16(ctx.code_count + 1))); /* jump to start */
+ pracc_add(&ctx, 0, MIPS32_MFC0(15, 31, 0)); /* restore $15 from DeSave*/
+
+ ctx.retval = mips32_pracc_queue_exec(ejtag_info, &ctx, NULL);
+exit:
+ pracc_queue_free(&ctx);
+ return ctx.retval;
}
static int mips32_pracc_write_mem_generic(struct mips_ejtag *ejtag_info,
return retval;
/**
- * If we are in the cachable regoion and cache is activated,
- * we must clean D$ + invalidate I$ after we did the write,
- * so that changes do not continue to live only in D$, but to be
+ * If we are in the cacheable region and cache is activated,
+ * we must clean D$ (if Cache Coherency Attribute is set to 3) + invalidate I$ after we did the write,
+ * so that changes do not continue to live only in D$ (if CCA = 3), but to be
* replicated in I$ also (maybe we wrote the istructions)
*/
uint32_t conf = 0;
}
/**
- * Check cachablitiy bits coherency algorithm -
+ * Check cachablitiy bits coherency algorithm
* is the region cacheable or uncached.
* If cacheable we have to synchronize the cache
*/
- if (cached == 0x3) {
- uint32_t start_addr, end_addr;
- uint32_t rel;
-
- start_addr = addr;
- end_addr = addr + count * size;
-
- /** select cache synchronisation mechanism based on Architecture Release */
- rel = (conf & MIPS32_CONFIG0_AR_MASK) >> MIPS32_CONFIG0_AR_SHIFT;
- switch (rel) {
- case MIPS32_ARCH_REL1:
- /* MIPS32/64 Release 1 - we must use cache instruction */
- mips32_pracc_clean_invalidate_cache(ejtag_info, start_addr, end_addr);
- break;
- case MIPS32_ARCH_REL2:
- /* MIPS32/64 Release 2 - we can use synci instruction */
- mips32_pracc_sync_cache(ejtag_info, start_addr, end_addr);
- break;
- default:
- /* what ? */
- break;
+ if (cached == 3 || cached == 0) { /* Write back cache or write through cache */
+ uint32_t start_addr = addr;
+ uint32_t end_addr = addr + count * size;
+ uint32_t rel = (conf & MIPS32_CONFIG0_AR_MASK) >> MIPS32_CONFIG0_AR_SHIFT;
+ if (rel > 1) {
+ LOG_DEBUG("Unknown release in cache code");
+ return ERROR_FAIL;
}
+ retval = mips32_pracc_synchronize_cache(ejtag_info, start_addr, end_addr, cached, rel);
}
return retval;
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