x86/boot: Rename conflicting 'boot_params' pointer to 'boot_params_ptr'

The x86 decompressor is built and linked as a separate executable, but
it shares components with the kernel proper, which are either #include'd
as C files, or linked into the decompresor as a static library (e.g, the
EFI stub)

Both the kernel itself and the decompressor define a global symbol
'boot_params' to refer to the boot_params struct, but in the former
case, it refers to the struct directly, whereas in the decompressor, it
refers to a global pointer variable referring to the struct boot_params
passed by the bootloader or constructed from scratch.

This ambiguity is unfortunate, and makes it impossible to assign this
decompressor variable from the x86 EFI stub, given that declaring it as
extern results in a clash. So rename the decompressor version (whose
scope is limited) to boot_params_ptr.

[ mingo: Renamed 'boot_params_p' to 'boot_params_ptr' for clarity ]

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org

diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
index 9caf89063e775eb054a857849eb8dd35a0ed9818..55c98fdd67d2b7f599ab333d5f1fa1c517c3e4eb 100644 (file)
--- a/arch/x86/boot/compressed/acpi.c
+++ b/arch/x86/boot/compressed/acpi.c
@@ -30,13 +30,13 @@ __efi_get_rsdp_addr(unsigned long cfg_tbl_pa, unsigned int cfg_tbl_len)
         * Search EFI system tables for RSDP. Preferred is ACPI_20_TABLE_GUID to
         * ACPI_TABLE_GUID because it has more features.
         */
-       rsdp_addr = efi_find_vendor_table(boot_params, cfg_tbl_pa, cfg_tbl_len,
+       rsdp_addr = efi_find_vendor_table(boot_params_ptr, cfg_tbl_pa, cfg_tbl_len,
                                          ACPI_20_TABLE_GUID);
        if (rsdp_addr)
                return (acpi_physical_address)rsdp_addr;
 
        /* No ACPI_20_TABLE_GUID found, fallback to ACPI_TABLE_GUID. */
-       rsdp_addr = efi_find_vendor_table(boot_params, cfg_tbl_pa, cfg_tbl_len,
+       rsdp_addr = efi_find_vendor_table(boot_params_ptr, cfg_tbl_pa, cfg_tbl_len,
                                          ACPI_TABLE_GUID);
        if (rsdp_addr)
                return (acpi_physical_address)rsdp_addr;
@@ -56,15 +56,15 @@ static acpi_physical_address efi_get_rsdp_addr(void)
        enum efi_type et;
        int ret;
 
-       et = efi_get_type(boot_params);
+       et = efi_get_type(boot_params_ptr);
        if (et == EFI_TYPE_NONE)
                return 0;
 
-       systab_pa = efi_get_system_table(boot_params);
+       systab_pa = efi_get_system_table(boot_params_ptr);
        if (!systab_pa)
                error("EFI support advertised, but unable to locate system table.");
 
-       ret = efi_get_conf_table(boot_params, &cfg_tbl_pa, &cfg_tbl_len);
+       ret = efi_get_conf_table(boot_params_ptr, &cfg_tbl_pa, &cfg_tbl_len);
        if (ret || !cfg_tbl_pa)
                error("EFI config table not found.");
 
@@ -156,7 +156,7 @@ acpi_physical_address get_rsdp_addr(void)
 {
        acpi_physical_address pa;
 
-       pa = boot_params->acpi_rsdp_addr;
+       pa = boot_params_ptr->acpi_rsdp_addr;
 
        if (!pa)
                pa = efi_get_rsdp_addr();
@@ -210,7 +210,7 @@ static unsigned long get_acpi_srat_table(void)
        rsdp = (struct acpi_table_rsdp *)get_cmdline_acpi_rsdp();
        if (!rsdp)
                rsdp = (struct acpi_table_rsdp *)(long)
-                       boot_params->acpi_rsdp_addr;
+                       boot_params_ptr->acpi_rsdp_addr;
 
        if (!rsdp)
                return 0;

diff --git a/arch/x86/boot/compressed/cmdline.c b/arch/x86/boot/compressed/cmdline.c
index f1add5d85da9d9881e44e2316a2f0018deb364f7..c1bb180973ea2a74eaf7b1788faeeba366643daa 100644 (file)
--- a/arch/x86/boot/compressed/cmdline.c
+++ b/arch/x86/boot/compressed/cmdline.c
@@ -14,9 +14,9 @@ static inline char rdfs8(addr_t addr)
 #include "../cmdline.c"
 unsigned long get_cmd_line_ptr(void)
 {
-       unsigned long cmd_line_ptr = boot_params->hdr.cmd_line_ptr;
+       unsigned long cmd_line_ptr = boot_params_ptr->hdr.cmd_line_ptr;
 
-       cmd_line_ptr |= (u64)boot_params->ext_cmd_line_ptr << 32;
+       cmd_line_ptr |= (u64)boot_params_ptr->ext_cmd_line_ptr << 32;
 
        return cmd_line_ptr;
 }

diff --git a/arch/x86/boot/compressed/ident_map_64.c b/arch/x86/boot/compressed/ident_map_64.c
index bcc956c17872bbd3939b33c59889d39cfb3641ac..3c8593de8ccbfeee58b62210e6777046a7994518 100644 (file)
--- a/arch/x86/boot/compressed/ident_map_64.c
+++ b/arch/x86/boot/compressed/ident_map_64.c
@@ -151,8 +151,9 @@ void initialize_identity_maps(void *rmode)
         * or does not touch all the pages covering them.
         */
        kernel_add_identity_map((unsigned long)_head, (unsigned long)_end);
-       boot_params = rmode;
-       kernel_add_identity_map((unsigned long)boot_params, (unsigned long)(boot_params + 1));
+       boot_params_ptr = rmode;
+       kernel_add_identity_map((unsigned long)boot_params_ptr,
+                               (unsigned long)(boot_params_ptr + 1));
        cmdline = get_cmd_line_ptr();
        kernel_add_identity_map(cmdline, cmdline + COMMAND_LINE_SIZE);
 
@@ -160,7 +161,7 @@ void initialize_identity_maps(void *rmode)
         * Also map the setup_data entries passed via boot_params in case they
         * need to be accessed by uncompressed kernel via the identity mapping.
         */
-       sd = (struct setup_data *)boot_params->hdr.setup_data;
+       sd = (struct setup_data *)boot_params_ptr->hdr.setup_data;
        while (sd) {
                unsigned long sd_addr = (unsigned long)sd;
 

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index 9193acf0e9cdec5d42bf89743ac16c280af51b41..dec961c6d16a7c476e509a39614176682884b6b1 100644 (file)
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -63,7 +63,7 @@ static unsigned long get_boot_seed(void)
        unsigned long hash = 0;
 
        hash = rotate_xor(hash, build_str, sizeof(build_str));
-       hash = rotate_xor(hash, boot_params, sizeof(*boot_params));
+       hash = rotate_xor(hash, boot_params_ptr, sizeof(*boot_params_ptr));
 
        return hash;
 }
@@ -383,7 +383,7 @@ static void handle_mem_options(void)
 static void mem_avoid_init(unsigned long input, unsigned long input_size,
                           unsigned long output)
 {
-       unsigned long init_size = boot_params->hdr.init_size;
+       unsigned long init_size = boot_params_ptr->hdr.init_size;
        u64 initrd_start, initrd_size;
        unsigned long cmd_line, cmd_line_size;
 
@@ -395,10 +395,10 @@ static void mem_avoid_init(unsigned long input, unsigned long input_size,
        mem_avoid[MEM_AVOID_ZO_RANGE].size = (output + init_size) - input;
 
        /* Avoid initrd. */
-       initrd_start  = (u64)boot_params->ext_ramdisk_image << 32;
-       initrd_start |= boot_params->hdr.ramdisk_image;
-       initrd_size  = (u64)boot_params->ext_ramdisk_size << 32;
-       initrd_size |= boot_params->hdr.ramdisk_size;
+       initrd_start  = (u64)boot_params_ptr->ext_ramdisk_image << 32;
+       initrd_start |= boot_params_ptr->hdr.ramdisk_image;
+       initrd_size  = (u64)boot_params_ptr->ext_ramdisk_size << 32;
+       initrd_size |= boot_params_ptr->hdr.ramdisk_size;
        mem_avoid[MEM_AVOID_INITRD].start = initrd_start;
        mem_avoid[MEM_AVOID_INITRD].size = initrd_size;
        /* No need to set mapping for initrd, it will be handled in VO. */
@@ -413,8 +413,8 @@ static void mem_avoid_init(unsigned long input, unsigned long input_size,
        }
 
        /* Avoid boot parameters. */
-       mem_avoid[MEM_AVOID_BOOTPARAMS].start = (unsigned long)boot_params;
-       mem_avoid[MEM_AVOID_BOOTPARAMS].size = sizeof(*boot_params);
+       mem_avoid[MEM_AVOID_BOOTPARAMS].start = (unsigned long)boot_params_ptr;
+       mem_avoid[MEM_AVOID_BOOTPARAMS].size = sizeof(*boot_params_ptr);
 
        /* We don't need to set a mapping for setup_data. */
 
@@ -447,7 +447,7 @@ static bool mem_avoid_overlap(struct mem_vector *img,
        }
 
        /* Avoid all entries in the setup_data linked list. */
-       ptr = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
+       ptr = (struct setup_data *)(unsigned long)boot_params_ptr->hdr.setup_data;
        while (ptr) {
                struct mem_vector avoid;
 
@@ -706,7 +706,7 @@ static inline bool memory_type_is_free(efi_memory_desc_t *md)
 static bool
 process_efi_entries(unsigned long minimum, unsigned long image_size)
 {
-       struct efi_info *e = &boot_params->efi_info;
+       struct efi_info *e = &boot_params_ptr->efi_info;
        bool efi_mirror_found = false;
        struct mem_vector region;
        efi_memory_desc_t *md;
@@ -777,8 +777,8 @@ static void process_e820_entries(unsigned long minimum,
        struct boot_e820_entry *entry;
 
        /* Verify potential e820 positions, appending to slots list. */
-       for (i = 0; i < boot_params->e820_entries; i++) {
-               entry = &boot_params->e820_table[i];
+       for (i = 0; i < boot_params_ptr->e820_entries; i++) {
+               entry = &boot_params_ptr->e820_table[i];
                /* Skip non-RAM entries. */
                if (entry->type != E820_TYPE_RAM)
                        continue;
@@ -852,7 +852,7 @@ void choose_random_location(unsigned long input,
                return;
        }
 
-       boot_params->hdr.loadflags |= KASLR_FLAG;
+       boot_params_ptr->hdr.loadflags |= KASLR_FLAG;
 
        if (IS_ENABLED(CONFIG_X86_32))
                mem_limit = KERNEL_IMAGE_SIZE;

diff --git a/arch/x86/boot/compressed/mem.c b/arch/x86/boot/compressed/mem.c
index 3c1609245f2add2baaade4820dcfdd3be3285dc2..b3c3a4be7471f17421da15901f1ce0b290942457 100644 (file)
--- a/arch/x86/boot/compressed/mem.c
+++ b/arch/x86/boot/compressed/mem.c
@@ -54,17 +54,17 @@ bool init_unaccepted_memory(void)
        enum efi_type et;
        int ret;
 
-       et = efi_get_type(boot_params);
+       et = efi_get_type(boot_params_ptr);
        if (et == EFI_TYPE_NONE)
                return false;
 
-       ret = efi_get_conf_table(boot_params, &cfg_table_pa, &cfg_table_len);
+       ret = efi_get_conf_table(boot_params_ptr, &cfg_table_pa, &cfg_table_len);
        if (ret) {
                warn("EFI config table not found.");
                return false;
        }
 
-       table = (void *)efi_find_vendor_table(boot_params, cfg_table_pa,
+       table = (void *)efi_find_vendor_table(boot_params_ptr, cfg_table_pa,
                                              cfg_table_len, guid);
        if (!table)
                return false;

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index f711f2a85862e9ef017d3e0d0d63e63728201399..b99e08e6815b1a84ecb016fc53c18d5490e8a96d 100644 (file)
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -46,7 +46,7 @@ void *memmove(void *dest, const void *src, size_t n);
 /*
  * This is set up by the setup-routine at boot-time
  */
-struct boot_params *boot_params;
+struct boot_params *boot_params_ptr;
 
 struct port_io_ops pio_ops;
 
@@ -132,8 +132,8 @@ void __putstr(const char *s)
        if (lines == 0 || cols == 0)
                return;
 
-       x = boot_params->screen_info.orig_x;
-       y = boot_params->screen_info.orig_y;
+       x = boot_params_ptr->screen_info.orig_x;
+       y = boot_params_ptr->screen_info.orig_y;
 
        while ((c = *s++) != '\0') {
                if (c == '\n') {
@@ -154,8 +154,8 @@ void __putstr(const char *s)
                }
        }
 
-       boot_params->screen_info.orig_x = x;
-       boot_params->screen_info.orig_y = y;
+       boot_params_ptr->screen_info.orig_x = x;
+       boot_params_ptr->screen_info.orig_y = y;
 
        pos = (x + cols * y) * 2;       /* Update cursor position */
        outb(14, vidport);
@@ -382,14 +382,14 @@ asmlinkage __visible void *extract_kernel(void *rmode, unsigned char *output)
        size_t entry_offset;
 
        /* Retain x86 boot parameters pointer passed from startup_32/64. */
-       boot_params = rmode;
+       boot_params_ptr = rmode;
 
        /* Clear flags intended for solely in-kernel use. */
-       boot_params->hdr.loadflags &= ~KASLR_FLAG;
+       boot_params_ptr->hdr.loadflags &= ~KASLR_FLAG;
 
-       sanitize_boot_params(boot_params);
+       sanitize_boot_params(boot_params_ptr);
 
-       if (boot_params->screen_info.orig_video_mode == 7) {
+       if (boot_params_ptr->screen_info.orig_video_mode == 7) {
                vidmem = (char *) 0xb0000;
                vidport = 0x3b4;
        } else {
@@ -397,8 +397,8 @@ asmlinkage __visible void *extract_kernel(void *rmode, unsigned char *output)
                vidport = 0x3d4;
        }
 
-       lines = boot_params->screen_info.orig_video_lines;
-       cols = boot_params->screen_info.orig_video_cols;
+       lines = boot_params_ptr->screen_info.orig_video_lines;
+       cols = boot_params_ptr->screen_info.orig_video_cols;
 
        init_default_io_ops();
 
@@ -417,7 +417,7 @@ asmlinkage __visible void *extract_kernel(void *rmode, unsigned char *output)
         * so that early debugging output from the RSDP parsing code can be
         * collected.
         */
-       boot_params->acpi_rsdp_addr = get_rsdp_addr();
+       boot_params_ptr->acpi_rsdp_addr = get_rsdp_addr();
 
        debug_putstr("early console in extract_kernel\n");
 

diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index cc70d3fb90497ed82cadd61546cd215c2933173b..c0d502bd871616663f4de30c3250f0ae9d243ec1 100644 (file)
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -61,7 +61,6 @@ extern memptr free_mem_ptr;
 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);
 #define error_putstr(__x)  __putstr(__x)

diff --git a/arch/x86/boot/compressed/pgtable_64.c b/arch/x86/boot/compressed/pgtable_64.c
index 7939eb6e6ce9bb0108cc5461b3df1fed5a66c7a0..51f957b24ba7a2babdd7c89d3b6cf0b070519691 100644 (file)
--- a/arch/x86/boot/compressed/pgtable_64.c
+++ b/arch/x86/boot/compressed/pgtable_64.c
@@ -28,7 +28,6 @@ static char trampoline_save[TRAMPOLINE_32BIT_SIZE];
  */
 unsigned long *trampoline_32bit __section(".data");
 
-extern struct boot_params *boot_params;
 int cmdline_find_option_bool(const char *option);
 
 static unsigned long find_trampoline_placement(void)
@@ -49,7 +48,7 @@ static unsigned long find_trampoline_placement(void)
         *
         * Only look for values in the legacy ROM for non-EFI system.
         */
-       signature = (char *)&boot_params->efi_info.efi_loader_signature;
+       signature = (char *)&boot_params_ptr->efi_info.efi_loader_signature;
        if (strncmp(signature, EFI32_LOADER_SIGNATURE, 4) &&
            strncmp(signature, EFI64_LOADER_SIGNATURE, 4)) {
                ebda_start = *(unsigned short *)0x40e << 4;
@@ -65,10 +64,10 @@ static unsigned long find_trampoline_placement(void)
        bios_start = round_down(bios_start, PAGE_SIZE);
 
        /* Find the first usable memory region under bios_start. */
-       for (i = boot_params->e820_entries - 1; i >= 0; i--) {
+       for (i = boot_params_ptr->e820_entries - 1; i >= 0; i--) {
                unsigned long new = bios_start;
 
-               entry = &boot_params->e820_table[i];
+               entry = &boot_params_ptr->e820_table[i];
 
                /* Skip all entries above bios_start. */
                if (bios_start <= entry->addr)
@@ -107,7 +106,7 @@ asmlinkage void configure_5level_paging(struct boot_params *bp, void *pgtable)
        bool l5_required = false;
 
        /* Initialize boot_params. Required for cmdline_find_option_bool(). */
-       boot_params = bp;
+       boot_params_ptr = bp;
 
        /*
         * Check if LA57 is desired and supported.

diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c
index dc8c876fbd8f8f51c53a26237094dfd6580c8fe2..9c075b526de4ffae5a6dd52f4ca1c1428055c033 100644 (file)
--- a/arch/x86/boot/compressed/sev.c
+++ b/arch/x86/boot/compressed/sev.c
@@ -605,7 +605,7 @@ void sev_prep_identity_maps(unsigned long top_level_pgt)
         * accessed after switchover.
         */
        if (sev_snp_enabled()) {
-               unsigned long cc_info_pa = boot_params->cc_blob_address;
+               unsigned long cc_info_pa = boot_params_ptr->cc_blob_address;
                struct cc_blob_sev_info *cc_info;
 
                kernel_add_identity_map(cc_info_pa, cc_info_pa + sizeof(*cc_info));

diff --git a/arch/x86/include/asm/boot.h b/arch/x86/include/asm/boot.h
index 4ae14339cb8cc72da4df2442a363ca2f728573c6..74d5a1723d2dcdaf9074c76b8b6af7c206c59b3a 100644 (file)
--- a/arch/x86/include/asm/boot.h
+++ b/arch/x86/include/asm/boot.h
@@ -68,6 +68,8 @@ extern const unsigned long kernel_total_size;
 
 unsigned long decompress_kernel(unsigned char *outbuf, unsigned long virt_addr,
                                void (*error)(char *x));
+
+extern struct boot_params *boot_params_ptr;
 #endif
 
 #endif /* _ASM_X86_BOOT_H */