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feat(lab02): WIP add ex05

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This commit is contained in:
Rémi Heredero
2026-03-31 13:57:53 +02:00
parent da2639d6f3
commit fb8de73be8
2 changed files with 101 additions and 10 deletions
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10
doc/lab-01_02.typ
View File

@@ -332,13 +332,19 @@ for (int i = 0; i < elements; i++) {
$
The chip ID can be verified in ```/proc/iomem```.
The register value of the temperature can be verified in the file: ```/sys/class/thermal/thermal_zone0/temp```.
The MAC address can be verified with ``` ifconfig```.
]
)
The resources are savec in a struct:
```bash
static struct resource* resources[3] = {[0] = 0,};
```
resources[0] is reserved for the chip ID, resources[1] for the temperature sensor and resources[2] for the Ethernet controller.
//-------------------
// Exercise 6: Kernel thread
//-------------------

97
src/01-skeleton/skeleton.c
View File

@@ -5,37 +5,51 @@
#include <linux/moduleparam.h> // needed for module parameters
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/slab.h> // dynamic memory allocation
#include <linux/list.h> // linked list
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/io.h>
#define TEXT_LENGTH_MAX 255
static char* text = "dummy text";
module_param(text, charp, 0664);
static int elements = 1;
module_param(elements, int, 0);
// Ex04 - Dynamic memory allocation and linked list
struct element {
char text[TEXT_LENGTH_MAX];
int unique_number;
int32_t unique_number;
struct list_head node;
};
static LIST_HEAD (list_unique_elements);
// Ex05 - Memory-mapped I/O
static struct resource* resources[3] = {[0] = 0,};
static int __init skeleton_init(void) {
pr_info("Linux module skeleton ex04 loaded\n");
pr_info("Linux module skeleton ex05 loaded\n");
pr_debug(" text: %s\n elements: %d\n", text, elements);
// Ex04 - Dynamic memory allocation and linked list
struct element* element_ptr = kcalloc(elements, sizeof(struct element), GFP_KERNEL);
if (element_ptr == 0) {
pr_err("Failed to allocate memory for %d elements\n", elements);
return -ENOMEM;
}
int i;
const int length = TEXT_LENGTH_MAX - 1;
uint8_t i;
const uint8_t length = TEXT_LENGTH_MAX - 1;
for (i = 0; i < elements; i++) {
struct element* e = element_ptr + i;
if (e != 0) {
@@ -45,10 +59,75 @@ static int __init skeleton_init(void) {
pr_info ("add element %d: %s\n", e->unique_number, e->text);
}
}
// Ex05 - Memory-mapped I/O
unsigned char* registers[3] = {[0] = 0,};
uint32_t chipid[4] = {[0] = 0,};
uint32_t temperature = 0;
uint32_t mac_address[2] = {[0] = 0,};
resources[0] = request_mem_region(0x01c14000, 0x1000, "nanopi - chip ID");
resources[1] = request_mem_region(0x01C25000, 0x1000, "nanopi - temperature sensor");
resources[2] = request_mem_region(0x01C30000, 0x1000, "nanopi - Ethernet controller");
if ((resources[0] == 0) || (resources[1] == 0) || (resources[2] == 0)) {
pr_err("Failed to reserve memory region for chip ID, temperature sensor or Ethernet controller\n");
return -EFAULT;
}
registers[0] = ioremap(0x01c14000, 0x1000);
registers[1] = ioremap(0x01C25000, 0x1000);
registers[2] = ioremap(0x01C30000, 0x1000);
if (registers[0] == 0) {
pr_err("Failed to map processor registers for chip ID\n");
return -EFAULT;
}
if (registers[1] == 0) {
pr_err("Failed to map processor registers for temperature sensor\n");
return -EFAULT;
}
if (registers[2] == 0) {
pr_err("Failed to map processor registers for Ethernet controller\n");
return -EFAULT;
}
chipid[0] = ioread32(registers[0] + 0x200);
chipid[1] = ioread32(registers[0] + 0x204);
chipid[2] = ioread32(registers[0] + 0x208);
chipid[3] = ioread32(registers[0] + 0x20c);
pr_info(
"chipid=%08x'%08x'%08x'%08x\n",
chipid[0], chipid[1], chipid[2], chipid[3]
);
temperature = -1991 * (int32_t) ioread32(registers[1] + 0x80) / 10 + 223000;
pr_info(
"temperature=%d (register value: %d)\n",
temperature, ioread32(registers[1] + 0x80)
);
mac_address[0] = ioread32(registers[2] + 0x50);
mac_address[1] = ioread32(registers[2] + 0x54);
pr_info(
"mac-addr=%02x:%02x:%02x:%02x:%02x:%02x\n",
(mac_address[1] >> 0) & 0xff,
(mac_address[1] >> 8) & 0xff,
(mac_address[1] >> 16) & 0xff,
(mac_address[1] >> 24) & 0xff,
(mac_address[0] >> 0) & 0xff,
(mac_address[0] >> 8) & 0xff
);
iounmap(registers[0]);
iounmap(registers[1]);
iounmap(registers[2]);
return 0;
}
static void __exit skeleton_exit(void) {
// Ex04 - Dynamic memory allocation and linked list
struct element* e;
while (!list_empty(&list_unique_elements)) {
@@ -57,6 +136,12 @@ static void __exit skeleton_exit(void) {
list_del(&e->node);
kfree(e);
}
// Ex05 - Memory-mapped I/O
if (resources[0] != 0) release_mem_region(0x01c14000, 0x1000);
if (resources[1] != 0) release_mem_region(0x01C25000, 0x1000);
if (resources[2] != 0) release_mem_region(0x01C30000, 0x1000);
pr_info ("Linux module skeleton unloaded\n");
}