More structural changes to get ready for stand-alone event engines

1 files changed, 290 insertions, 0 deletions

diff --git a/pcilib/register.c b/pcilib/register.c
new file mode 100644
index 0000000..8d138b8
--- /dev/null
+++ b/pcilib/register.c
@@ -0,0 +1,290 @@
+#include <stdio.h>
+#include <string.h>
+#include <strings.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "pci.h"
+#include "bank.h"
+
+#include "tools.h"
+#include "error.h"
+
+
+int pcilib_add_registers(pcilib_t *ctx, size_t n, const pcilib_register_description_t *registers) {
+	// DS: What we are doing if register exists?
+	
+    pcilib_register_description_t *regs;
+    size_t size;
+
+    if (!n) {
+	for (n = 0; registers[n].bits; n++);
+    }
+
+    if ((ctx->num_reg + n + 1) > ctx->alloc_reg) {
+	for (size = ctx->alloc_reg; size < 2 * (n + ctx->num_reg + 1); size<<=1);
+
+	regs = (pcilib_register_description_t*)realloc(ctx->registers, size * sizeof(pcilib_register_description_t));
+	if (!regs) return PCILIB_ERROR_MEMORY;
+
+	ctx->registers = regs;
+	ctx->model_info.registers = regs;
+	ctx->alloc_reg = size;
+    }
+
+    memcpy(ctx->registers + ctx->num_reg, registers, n * sizeof(pcilib_register_description_t));
+    memset(ctx->registers + ctx->num_reg + n, 0, sizeof(pcilib_register_description_t));
+    ctx->num_reg += n;
+
+    return 0;
+}
+
+
+static int pcilib_read_register_space_internal(pcilib_t *ctx, pcilib_register_bank_t bank, pcilib_register_addr_t addr, size_t n, pcilib_register_size_t offset, pcilib_register_size_t bits, pcilib_register_value_t *buf) {
+    int err;
+    size_t i;
+
+    pcilib_register_bank_context_t *bctx = ctx->bank_ctx[bank];
+    const pcilib_register_protocol_api_description_t *bapi = bctx->api;
+    const pcilib_register_bank_description_t *b = bctx->bank;
+
+    int access = b->access / 8;
+
+    assert(bits < 8 * sizeof(pcilib_register_value_t));
+
+    if (!bapi->read) {
+	pcilib_error("Used register protocol does not define a way to read register value");
+	return PCILIB_ERROR_NOTSUPPORTED;
+    }
+
+    if (((addr + n) > b->size)||(((addr + n) == b->size)&&(bits))) {
+	if ((b->format)&&(strchr(b->format, 'x')))
+	    pcilib_error("Accessing register (%u regs at addr 0x%x) out of register space (%u registers total)", bits?(n+1):n, addr, b->size);
+	else 
+	    pcilib_error("Accessing register (%u regs at addr %u) out of register space (%u registers total)", bits?(n+1):n, addr, b->size);
+	return PCILIB_ERROR_OUTOFRANGE;
+    }
+
+    //err = pcilib_init_register_banks(ctx);
+    //if (err) return err;
+    
+    //n += bits / b->access;
+    //bits %= b->access; 
+    
+    for (i = 0; i < n; i++) {
+	err = bapi->read(ctx, bctx, addr + i * access, buf + i);
+	if (err) break;
+    }
+    
+    if ((bits > 0)&&(!err)) {
+	pcilib_register_value_t val = 0;
+	err = bapi->read(ctx, bctx, addr + n * access, &val);
+
+	val = (val >> offset)&BIT_MASK(bits);
+	memcpy(buf + n, &val, sizeof(pcilib_register_value_t));
+    }
+    
+    return err;
+}
+
+int pcilib_read_register_space(pcilib_t *ctx, const char *bank, pcilib_register_addr_t addr, size_t n, pcilib_register_value_t *buf) {
+    pcilib_register_bank_t bank_id = pcilib_find_register_bank(ctx, bank);
+    if (bank_id == PCILIB_REGISTER_BANK_INVALID) {
+	if (bank) pcilib_error("Invalid register bank is specified (%s)", bank);
+	else pcilib_error("Register bank should be specified");
+	return PCILIB_ERROR_INVALID_BANK;
+    }
+    
+    return pcilib_read_register_space_internal(ctx, bank_id, addr, n, 0, 0, buf);
+}
+
+int pcilib_read_register_by_id(pcilib_t *ctx, pcilib_register_t reg, pcilib_register_value_t *value) {
+    int err;
+    size_t i, n;
+    pcilib_register_size_t bits;
+    pcilib_register_value_t res;
+    pcilib_register_bank_t bank;
+    const pcilib_register_description_t *r;
+    const pcilib_register_bank_description_t *b;
+    const pcilib_model_description_t *model_info = pcilib_get_model_description(ctx);
+
+    r = model_info->registers + reg;
+    
+    bank = pcilib_find_register_bank_by_addr(ctx, r->bank);
+    if (bank == PCILIB_REGISTER_BANK_INVALID) return PCILIB_ERROR_INVALID_BANK;
+    
+    b = model_info->banks + bank;
+    
+    n = r->bits / b->access;
+    bits = r->bits % b->access; 
+
+    pcilib_register_value_t buf[n + 1];
+    err = pcilib_read_register_space_internal(ctx, bank, r->addr, n, r->offset, bits, buf);
+
+    if ((b->endianess == PCILIB_BIG_ENDIAN)||((b->endianess == PCILIB_HOST_ENDIAN)&&(ntohs(1) == 1))) {
+	pcilib_error("Big-endian byte order support is not implemented");
+	return PCILIB_ERROR_NOTSUPPORTED;
+    } else {
+	res = 0;
+	if (bits) ++n;
+	for (i = 0; i < n; i++) {
+	    res |= buf[i] << (i * b->access);
+	}
+    }
+    
+    *value = res;
+    
+    return err;
+}
+
+
+int pcilib_read_register(pcilib_t *ctx, const char *bank, const char *regname, pcilib_register_value_t *value) {
+    int reg;
+
+    reg = pcilib_find_register(ctx, bank, regname);
+    if (reg < 0) {
+	pcilib_error("Register (%s) is not found", regname);
+	return PCILIB_ERROR_NOTFOUND;
+    }
+
+    return pcilib_read_register_by_id(ctx, reg, value);
+}
+
+
+static int pcilib_write_register_space_internal(pcilib_t *ctx, pcilib_register_bank_t bank, pcilib_register_addr_t addr, size_t n, pcilib_register_size_t offset, pcilib_register_size_t bits, pcilib_register_value_t rwmask, pcilib_register_value_t *buf) {
+    int err;
+    size_t i;
+
+    pcilib_register_bank_context_t *bctx = ctx->bank_ctx[bank];
+    const pcilib_register_protocol_api_description_t *bapi = bctx->api;
+    const pcilib_register_bank_description_t *b = bctx->bank;
+
+    int access = b->access / 8;
+
+    assert(bits < 8 * sizeof(pcilib_register_value_t));
+
+    if (!bapi->write) {
+	pcilib_error("Used register protocol does not define a way to write value into the register");
+	return PCILIB_ERROR_NOTSUPPORTED;
+    }
+
+    if (((addr + n) > b->size)||(((addr + n) == b->size)&&(bits))) {
+	if ((b->format)&&(strchr(b->format, 'x')))
+	    pcilib_error("Accessing register (%u regs at addr 0x%x) out of register space (%u registers total)", bits?(n+1):n, addr, b->size);
+	else 
+	    pcilib_error("Accessing register (%u regs at addr %u) out of register space (%u registers total)", bits?(n+1):n, addr, b->size);
+	return PCILIB_ERROR_OUTOFRANGE;
+    }
+
+    //err = pcilib_init_register_banks(ctx);
+    //if (err) return err;
+    
+    //n += bits / b->access;
+    //bits %= b->access; 
+    
+    for (i = 0; i < n; i++) {
+	err = bapi->write(ctx, bctx, addr + i * access, buf[i]);
+	if (err) break;
+    }
+    
+    if ((bits > 0)&&(!err)) {
+	pcilib_register_value_t val = (buf[n]&BIT_MASK(bits))<<offset;
+	pcilib_register_value_t mask = BIT_MASK(bits)<<offset;
+
+	if (~mask&rwmask) {
+	    pcilib_register_value_t rval;
+
+	    if (!bapi->read) {
+		pcilib_error("Used register protocol does not define a way to read register. Therefore, it is only possible to write a full bank word, not partial as required by the accessed register");
+		return PCILIB_ERROR_NOTSUPPORTED;
+	    }
+
+	    err = bapi->read(ctx, bctx, addr + n * access, &rval); 
+	    if (err) return err;
+
+	    val |= (rval & rwmask & ~mask);
+	}
+	
+	err = bapi->write(ctx, bctx, addr + n * access, val);
+    }
+    
+    return err;
+}
+
+int pcilib_write_register_space(pcilib_t *ctx, const char *bank, pcilib_register_addr_t addr, size_t n, pcilib_register_value_t *buf) {
+    pcilib_register_bank_t bank_id = pcilib_find_register_bank(ctx, bank);
+    if (bank_id == PCILIB_REGISTER_BANK_INVALID) {
+	if (bank) pcilib_error("Invalid register bank is specified (%s)", bank);
+	else pcilib_error("Register bank should be specified");
+	return PCILIB_ERROR_INVALID_BANK;
+    }
+    
+    return pcilib_write_register_space_internal(ctx, bank_id, addr, n, 0, 0, 0, buf);
+}
+
+
+int pcilib_write_register_by_id(pcilib_t *ctx, pcilib_register_t reg, pcilib_register_value_t value) {
+    int err;
+    size_t i, n;
+    pcilib_register_size_t bits;
+    pcilib_register_bank_t bank;
+    pcilib_register_value_t res;
+    const pcilib_register_description_t *r;
+    const pcilib_register_bank_description_t *b;
+    const pcilib_model_description_t *model_info = pcilib_get_model_description(ctx);
+
+    r = model_info->registers + reg;
+
+    bank = pcilib_find_register_bank_by_addr(ctx, r->bank);
+    if (bank == PCILIB_REGISTER_BANK_INVALID) return PCILIB_ERROR_INVALID_BANK;
+
+    b = model_info->banks + bank;
+    
+    n = r->bits / b->access;
+    bits = r->bits % b->access; 
+
+    pcilib_register_value_t buf[n + 1];
+    memset(buf, 0, (n + 1) * sizeof(pcilib_register_value_t));
+    
+    if ((b->endianess == PCILIB_BIG_ENDIAN)||((b->endianess == PCILIB_HOST_ENDIAN)&&(ntohs(1) == 1))) {
+	pcilib_error("Big-endian byte order support is not implemented");
+	return PCILIB_ERROR_NOTSUPPORTED;
+    } else {
+	if (b->access == sizeof(pcilib_register_value_t) * 8) {
+	    buf[0] = value;
+	} else {
+	    for (i = 0, res = value; (res > 0)&&(i <= n); ++i) {
+		buf[i] = res & BIT_MASK(b->access);
+	        res >>= b->access;
+	    }
+	
+	    if (res) {
+		pcilib_error("Value %i is too big to fit in the register %s", value, r->name);
+		return PCILIB_ERROR_OUTOFRANGE;
+	    }
+	}
+    }
+
+    err = pcilib_write_register_space_internal(ctx, bank, r->addr, n, r->offset, bits, r->rwmask, buf);
+    return err;
+}
+
+int pcilib_write_register(pcilib_t *ctx, const char *bank, const char *regname, pcilib_register_value_t value) {
+    int reg;
+    
+    reg = pcilib_find_register(ctx, bank, regname);
+    if (reg < 0) {
+	pcilib_error("Register (%s) is not found", regname);
+	return PCILIB_ERROR_NOTFOUND;
+    }
+
+    return pcilib_write_register_by_id(ctx, reg, value);
+}