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Make the Linux kernel & Fiwix->Linux kexec more bare-metal-friendly

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* Enable additional hardware drivers in Linux for better bare metal
  display, network & input device compatibility
* Disable ATA-over-Ethernet support, because it spams the network
  with unnecessary packets, is basically useless for bootstrapping,
  and may even be a security risk
* Increase Fiwix initrd size to 1280MB to fit a larger Linux build
* Make the Fiwix kexec size configurable the same way as initrd
  (and reduce from 280MB to 256MB which is sufficient in my testing)
* Use a more conservative memory map for Fiwix & Linux
* Boot Linux with consoleblank=0 on bare metal, so the build won't
  go blind after 5 minutes
* Support kexec-fiwix with interrupts disabled (will be useful later
  when builder-hex0 is updated)
This commit is contained in:
Gábor Stefanik 2024-01-02 00:46:32 +01:00
parent 133c05426c
commit 82c570694a
6 changed files with 582 additions and 338 deletions
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22
steps/kexec-fiwix-1.0/src/kexec-fiwix.c
View file

@ -6,7 +6,8 @@
#include "multiboot1.h"
#define MULTIBOOT_MAGIC 0x2BADB002
#define INITRD_MB 1152
#define INITRD_MB 1280
#define KEXEC_MB 256
int main() {
/* Read the kernel */
@ -81,11 +82,11 @@ int main() {
char *bare_metal = getenv("BARE_METAL");
if (bare_metal != NULL && strcmp(bare_metal, "True") == 0)
{
sprintf(cmdline, "fiwix root=/dev/ram0 ramdisksize=%d initrd=fiwix.ext2 kexec_proto=linux kexec_size=280000 kexec_cmdline=\"init=/init\"", INITRD_MB * 1024);
sprintf(cmdline, "fiwix root=/dev/ram0 ramdisksize=%d initrd=fiwix.ext2 kexec_proto=linux kexec_size=%d kexec_cmdline=\"init=/init consoleblank=0\"", INITRD_MB * 1024, KEXEC_MB * 1024);
}
else
{
sprintf(cmdline, "fiwix console=/dev/ttyS0 root=/dev/ram0 ramdisksize=%d initrd=fiwix.ext2 kexec_proto=linux kexec_size=280000 kexec_cmdline=\"init=/init console=ttyS0\"", INITRD_MB * 1024);
sprintf(cmdline, "fiwix console=/dev/ttyS0 root=/dev/ram0 ramdisksize=%d initrd=fiwix.ext2 kexec_proto=linux kexec_size=%d kexec_cmdline=\"init=/init console=ttyS0\"", INITRD_MB * 1024, KEXEC_MB * 1024);
}
char * boot_loader_name = "kexec-fiwix";
@ -127,13 +128,13 @@ int main() {
pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
pmultiboot_memory_map->addr = 0x00000000;
pmultiboot_memory_map->len = 0x0009FC00;
pmultiboot_memory_map->len = 0x00080000;
pmultiboot_memory_map->type = MULTIBOOT_MEMORY_AVAILABLE;
pmultiboot_memory_map++;
pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
pmultiboot_memory_map->addr = 0x0009FC00;
pmultiboot_memory_map->len = 0x00000400;
pmultiboot_memory_map->addr = 0x00080000;
pmultiboot_memory_map->len = 0x00020000;
pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
pmultiboot_memory_map++;
@ -145,13 +146,13 @@ int main() {
pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
pmultiboot_memory_map->addr = 0x00100000;
pmultiboot_memory_map->len = 0xBFEE0000;
pmultiboot_memory_map->len = 0xBC000000;
pmultiboot_memory_map->type = MULTIBOOT_MEMORY_AVAILABLE;
pmultiboot_memory_map++;
pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
pmultiboot_memory_map->addr = 0XBFFE0000;
pmultiboot_memory_map->len = 0x00020000;
pmultiboot_memory_map->addr = 0XBC000000;
pmultiboot_memory_map->len = 0x04000000;
pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
pmultiboot_memory_map++;
@ -208,6 +209,7 @@ int main() {
0xF3, 0xA4, /* rep movsb */
0xB8, 0x00, 0x00, 0x00, 0x00, /* mov eax, 0x00000000 */
0xBB, 0x00, 0x00, 0x00, 0x00, /* mov ebx, 0x00000000 */
0xFB, /* sti */
0xEA, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00 /* jmp far 0x0008:0x00000000 */
};
@ -217,7 +219,7 @@ int main() {
*((unsigned int *) &trampoline[11]) = INITRD_MB * 1024 * 1024;
*((unsigned int *) &trampoline[19]) = magic;
*((unsigned int *) &trampoline[24]) = multiboot_info_num;
*((unsigned int *) &trampoline[29]) = e_entry;
*((unsigned int *) &trampoline[30]) = e_entry;
memcpy((void *)0x4000, trampoline, sizeof(trampoline));