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Date: Thu, 15 Dec 2022 15:38:02 +0300
From: Evgeniy Baskov <baskov@...ras.ru>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: Evgeniy Baskov <baskov@...ras.ru>, Borislav Petkov <bp@...en8.de>,
Andy Lutomirski <luto@...nel.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Alexey Khoroshilov <khoroshilov@...ras.ru>,
Peter Jones <pjones@...hat.com>,
"Limonciello, Mario" <mario.limonciello@....com>,
joeyli <jlee@...e.com>, lvc-project@...uxtesting.org,
x86@...nel.org, linux-efi@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH v4 11/26] x86/boot: Make console interface more abstract
To be able to extract kernel from EFI, console output functions
need to be replaceable by alternative implementations.
Make all of those functions pointers.
Move serial console code to separate file.
Tested-by: Mario Limonciello <mario.limonciello@....com>
Tested-by: Peter Jones <pjones@...hat.com>
Signed-off-by: Evgeniy Baskov <baskov@...ras.ru>
---
arch/x86/boot/compressed/Makefile | 2 +-
arch/x86/boot/compressed/misc.c | 109 +------------------------
arch/x86/boot/compressed/misc.h | 9 ++-
arch/x86/boot/compressed/putstr.c | 130 ++++++++++++++++++++++++++++++
4 files changed, 139 insertions(+), 111 deletions(-)
create mode 100644 arch/x86/boot/compressed/putstr.c
diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 4dcab38f5a38..4b1524446875 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -93,7 +93,7 @@ $(obj)/misc.o: $(obj)/../voffset.h
vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/kernel_info.o $(obj)/head_$(BITS).o \
$(obj)/misc.o $(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \
- $(obj)/piggy.o $(obj)/cpuflags.o
+ $(obj)/piggy.o $(obj)/cpuflags.o $(obj)/putstr.o
vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 0c7ec290044d..aa4a22bc9cf9 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -53,13 +53,6 @@ struct port_io_ops pio_ops;
memptr free_mem_ptr;
memptr free_mem_end_ptr;
-static char *vidmem;
-static int vidport;
-
-/* These might be accessed before .bss is cleared, so use .data instead. */
-static int lines __section(".data");
-static int cols __section(".data");
-
#ifdef CONFIG_KERNEL_GZIP
#include "../../../../lib/decompress_inflate.c"
#endif
@@ -92,95 +85,6 @@ static int cols __section(".data");
* ../header.S.
*/
-static void scroll(void)
-{
- int i;
-
- memmove(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
- for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
- vidmem[i] = ' ';
-}
-
-#define XMTRDY 0x20
-
-#define TXR 0 /* Transmit register (WRITE) */
-#define LSR 5 /* Line Status */
-static void serial_putchar(int ch)
-{
- unsigned timeout = 0xffff;
-
- while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
- cpu_relax();
-
- outb(ch, early_serial_base + TXR);
-}
-
-void __putstr(const char *s)
-{
- int x, y, pos;
- char c;
-
- if (early_serial_base) {
- const char *str = s;
- while (*str) {
- if (*str == '\n')
- serial_putchar('\r');
- serial_putchar(*str++);
- }
- }
-
- if (lines == 0 || cols == 0)
- return;
-
- x = boot_params->screen_info.orig_x;
- y = boot_params->screen_info.orig_y;
-
- while ((c = *s++) != '\0') {
- if (c == '\n') {
- x = 0;
- if (++y >= lines) {
- scroll();
- y--;
- }
- } else {
- vidmem[(x + cols * y) * 2] = c;
- if (++x >= cols) {
- x = 0;
- if (++y >= lines) {
- scroll();
- y--;
- }
- }
- }
- }
-
- boot_params->screen_info.orig_x = x;
- boot_params->screen_info.orig_y = y;
-
- pos = (x + cols * y) * 2; /* Update cursor position */
- outb(14, vidport);
- outb(0xff & (pos >> 9), vidport+1);
- outb(15, vidport);
- outb(0xff & (pos >> 1), vidport+1);
-}
-
-void __puthex(unsigned long value)
-{
- char alpha[2] = "0";
- int bits;
-
- for (bits = sizeof(value) * 8 - 4; bits >= 0; bits -= 4) {
- unsigned long digit = (value >> bits) & 0xf;
-
- if (digit < 0xA)
- alpha[0] = '0' + digit;
- else
- alpha[0] = 'a' + (digit - 0xA);
-
- __putstr(alpha);
- }
-}
-
#ifdef CONFIG_X86_NEED_RELOCS
static void handle_relocations(void *output, unsigned long output_len,
unsigned long virt_addr)
@@ -406,17 +310,6 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
sanitize_boot_params(boot_params);
- if (boot_params->screen_info.orig_video_mode == 7) {
- vidmem = (char *) 0xb0000;
- vidport = 0x3b4;
- } else {
- vidmem = (char *) 0xb8000;
- vidport = 0x3d4;
- }
-
- lines = boot_params->screen_info.orig_video_lines;
- cols = boot_params->screen_info.orig_video_cols;
-
init_default_io_ops();
/*
@@ -427,7 +320,7 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
*/
early_tdx_detect();
- console_init();
+ init_bare_console();
/*
* Save RSDP address for later use. Have this after console_init()
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index 033db9b536e6..38d31bec062d 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -57,8 +57,8 @@ extern memptr free_mem_end_ptr;
void *malloc(int size);
void free(void *where);
extern struct boot_params *boot_params;
-void __putstr(const char *s);
-void __puthex(unsigned long value);
+extern void (*__putstr)(const char *s);
+extern void (*__puthex)(unsigned long value);
#define error_putstr(__x) __putstr(__x)
#define error_puthex(__x) __puthex(__x)
@@ -128,6 +128,11 @@ static inline void console_init(void)
{ }
#endif
+/* putstr.c */
+void init_bare_console(void);
+void init_console_func(void (*putstr_)(const char *),
+ void (*puthex_)(unsigned long));
+
#ifdef CONFIG_AMD_MEM_ENCRYPT
void sev_enable(struct boot_params *bp);
void sev_es_shutdown_ghcb(void);
diff --git a/arch/x86/boot/compressed/putstr.c b/arch/x86/boot/compressed/putstr.c
new file mode 100644
index 000000000000..44a4c3dacec5
--- /dev/null
+++ b/arch/x86/boot/compressed/putstr.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "misc.h"
+
+/* These might be accessed before .bss is cleared, so use .data instead. */
+static char *vidmem __section(".data");
+static int vidport __section(".data");
+static int lines __section(".data");
+static int cols __section(".data");
+
+void (*__putstr)(const char *s);
+void (*__puthex)(unsigned long value);
+
+static void putstr(const char *s);
+static void puthex(unsigned long value);
+
+void init_console_func(void (*putstr_)(const char *),
+ void (*puthex_)(unsigned long))
+{
+ __putstr = putstr_;
+ __puthex = puthex_;
+}
+
+void init_bare_console(void)
+{
+ init_console_func(putstr, puthex);
+
+ if (boot_params->screen_info.orig_video_mode == 7) {
+ vidmem = (char *) 0xb0000;
+ vidport = 0x3b4;
+ } else {
+ vidmem = (char *) 0xb8000;
+ vidport = 0x3d4;
+ }
+
+ lines = boot_params->screen_info.orig_video_lines;
+ cols = boot_params->screen_info.orig_video_cols;
+
+ console_init();
+}
+
+static void scroll(void)
+{
+ int i;
+
+ memmove(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
+ for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
+ vidmem[i] = ' ';
+}
+
+#define XMTRDY 0x20
+
+#define TXR 0 /* Transmit register (WRITE) */
+#define LSR 5 /* Line Status */
+
+static void serial_putchar(int ch)
+{
+ unsigned int timeout = 0xffff;
+
+ while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
+ cpu_relax();
+
+ outb(ch, early_serial_base + TXR);
+}
+
+static void putstr(const char *s)
+{
+ int x, y, pos;
+ char c;
+
+ if (early_serial_base) {
+ const char *str = s;
+
+ while (*str) {
+ if (*str == '\n')
+ serial_putchar('\r');
+ serial_putchar(*str++);
+ }
+ }
+
+ if (lines == 0 || cols == 0)
+ return;
+
+ x = boot_params->screen_info.orig_x;
+ y = boot_params->screen_info.orig_y;
+
+ while ((c = *s++) != '\0') {
+ if (c == '\n') {
+ x = 0;
+ if (++y >= lines) {
+ scroll();
+ y--;
+ }
+ } else {
+ vidmem[(x + cols * y) * 2] = c;
+ if (++x >= cols) {
+ x = 0;
+ if (++y >= lines) {
+ scroll();
+ y--;
+ }
+ }
+ }
+ }
+
+ boot_params->screen_info.orig_x = x;
+ boot_params->screen_info.orig_y = y;
+
+ pos = (x + cols * y) * 2; /* Update cursor position */
+ outb(14, vidport);
+ outb(0xff & (pos >> 9), vidport+1);
+ outb(15, vidport);
+ outb(0xff & (pos >> 1), vidport+1);
+}
+
+static void puthex(unsigned long value)
+{
+ char alpha[2] = "0";
+ int bits;
+
+ for (bits = sizeof(value) * 8 - 4; bits >= 0; bits -= 4) {
+ unsigned long digit = (value >> bits) & 0xf;
+
+ if (digit < 0xA)
+ alpha[0] = '0' + digit;
+ else
+ alpha[0] = 'a' + (digit - 0xA);
+
+ putstr(alpha);
+ }
+}
--
2.37.4
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