diff options
author | Simon Glass <sjg@chromium.org> | 2023-03-20 08:30:08 +1300 |
---|---|---|
committer | Heinrich Schuchardt <heinrich.schuchardt@canonical.com> | 2023-03-25 11:07:21 +0100 |
commit | 37c9f9cc86a2bcd8707d519945cecf08c079ef19 (patch) | |
tree | 1a266840c2b4b550c764c91b57432cf8b95bed28 /arch/x86/lib | |
parent | 1404914ddd959d43138ed08544da8c816e0fa66d (diff) | |
download | u-boot-37c9f9cc86a2bcd8707d519945cecf08c079ef19.zip u-boot-37c9f9cc86a2bcd8707d519945cecf08c079ef19.tar.gz u-boot-37c9f9cc86a2bcd8707d519945cecf08c079ef19.tar.bz2 |
x86: Support booting a 64-bit kernel from 64-bit U-Boot
Add the missing code to handle this. For a 64-bit kernel the entry
address is 0x200 bytes after the normal entry.
Rename the parameter to boot_linux_kernel() accordingly. Update the
comments to indicate that these are addresses, not pointers.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/x86/lib')
-rw-r--r-- | arch/x86/lib/bootm.c | 25 | ||||
-rw-r--r-- | arch/x86/lib/zimage.c | 15 |
2 files changed, 30 insertions, 10 deletions
diff --git a/arch/x86/lib/bootm.c b/arch/x86/lib/bootm.c index 873e2bc..9beb376 100644 --- a/arch/x86/lib/bootm.c +++ b/arch/x86/lib/bootm.c @@ -149,7 +149,7 @@ error: return 1; } -int boot_linux_kernel(ulong setup_base, ulong load_address, bool image_64bit) +int boot_linux_kernel(ulong setup_base, ulong entry, bool image_64bit) { bootm_announce_and_cleanup(); @@ -161,14 +161,23 @@ int boot_linux_kernel(ulong setup_base, ulong load_address, bool image_64bit) puts("Cannot boot 64-bit kernel on 32-bit machine\n"); return -EFAULT; } - /* At present 64-bit U-Boot does not support booting a + /* + * At present 64-bit U-Boot only supports booting a 64-bit * kernel. - * TODO(sjg@chromium.org): Support booting both 32-bit and - * 64-bit kernels from 64-bit U-Boot. + * + * TODO(sjg@chromium.org): Support booting 32-bit kernels from + * 64-bit U-Boot */ -#if !CONFIG_IS_ENABLED(X86_64) - return cpu_jump_to_64bit(setup_base, load_address); -#endif + if (CONFIG_IS_ENABLED(X86_64)) { + typedef void (*h_func)(ulong zero, ulong setup); + h_func func; + + /* jump to Linux with rdi=0, rsi=setup_base */ + func = (h_func)entry; + func(0, setup_base); + } else { + return cpu_jump_to_64bit(setup_base, entry); + } } else { /* * Set %ebx, %ebp, and %edi to 0, %esi to point to the @@ -190,7 +199,7 @@ int boot_linux_kernel(ulong setup_base, ulong load_address, bool image_64bit) "movl $0, %%ebp\n" "cli\n" "jmp *%[kernel_entry]\n" - :: [kernel_entry]"a"(load_address), + :: [kernel_entry]"a"(entry), [boot_params] "S"(setup_base), "b"(0), "D"(0) ); diff --git a/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c index a6d9151..e5ea512 100644 --- a/arch/x86/lib/zimage.c +++ b/arch/x86/lib/zimage.c @@ -504,13 +504,24 @@ static int do_zboot_info(struct cmd_tbl *cmdtp, int flag, int argc, static int do_zboot_go(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]) { + struct boot_params *params = state.base_ptr; + struct setup_header *hdr = ¶ms->hdr; + bool image_64bit; + ulong entry; int ret; disable_interrupts(); + entry = state.load_address; + image_64bit = false; + if (IS_ENABLED(CONFIG_X86_RUN_64BIT) && + (hdr->xloadflags & XLF_KERNEL_64)) { + entry += 0x200; + image_64bit = true; + } + /* we assume that the kernel is in place */ - ret = boot_linux_kernel((ulong)state.base_ptr, state.load_address, - false); + ret = boot_linux_kernel((ulong)state.base_ptr, entry, image_64bit); printf("Kernel returned! (err=%d)\n", ret); return CMD_RET_FAILURE; |