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authorRoland McGrath <roland@gnu.org>1999-06-02 07:00:13 +0000
committerRoland McGrath <roland@gnu.org>1999-06-02 07:00:13 +0000
commit6730c52cfdb1441d577dbad207423effa5b804b0 (patch)
treebbf8d5d8096b4be42945105fabfbe0663ce2796d /kern
parentbd94b566b3b3b986d92d71eda59bf475116b9a5e (diff)
1999-06-02 Roland McGrath <roland@baalperazim.frob.com>
* kern/bootstrap.c (build_args_and_stack): If kernel_cmdline is nonempty, give the bootstrap task an environment variable of "MULTIBOOT_CMDLINE=kernel command line" on its stack.
Diffstat (limited to 'kern')
-rw-r--r--kern/bootstrap.c41
1 files changed, 35 insertions, 6 deletions
diff --git a/kern/bootstrap.c b/kern/bootstrap.c
index 3643a5c..c3c971d 100644
--- a/kern/bootstrap.c
+++ b/kern/bootstrap.c
@@ -316,8 +316,8 @@ static void copy_bootstrap(void *e, struct exec_info *boot_exec_info)
while (i < lenp)
{
- vm_fault(user_map, text_page_start +i,
- load_protect_text ?
+ vm_fault(user_map, text_page_start +i,
+ load_protect_text ?
VM_PROT_READ|VM_PROT_EXECUTE :
VM_PROT_READ|VM_PROT_EXECUTE | VM_PROT_WRITE,
0,0,0);
@@ -351,6 +351,7 @@ static build_args_and_stack(boot_exec_info, va_alist)
int arg_item_len;
char * string_pos;
char * zero = (char *)0;
+ static const char cmdline_var[] = "MULTIBOOT_CMDLINE=";
#define STACK_SIZE (64*1024)
@@ -369,6 +370,9 @@ static build_args_and_stack(boot_exec_info, va_alist)
}
va_end(argv_ptr);
+ if (kernel_cmdline[0] != '\0')
+ arg_len += sizeof cmdline_var + strlen (kernel_cmdline);
+
/*
* Add space for:
* arg count
@@ -378,7 +382,7 @@ static build_args_and_stack(boot_exec_info, va_alist)
* and align to integer boundary
*/
arg_len += sizeof(integer_t)
- + (2 + arg_count) * sizeof(char *);
+ + (3 + arg_count) * sizeof(char *);
arg_len = (arg_len + sizeof(integer_t) - 1) & ~(sizeof(integer_t)-1);
/*
@@ -400,7 +404,7 @@ static build_args_and_stack(boot_exec_info, va_alist)
string_pos = arg_pos
+ sizeof(integer_t)
+ arg_count * sizeof(char *)
- + 2 * sizeof(char *);
+ + 3 * sizeof(char *);
/*
* first the argument count
@@ -431,10 +435,36 @@ static build_args_and_stack(boot_exec_info, va_alist)
va_end(argv_ptr);
/*
- * last, the trailing 0 argument and a null environment pointer.
+ * Null terminator for argv.
*/
(void) copyout((char *)&zero, arg_pos, sizeof(char *));
arg_pos += sizeof(char *);
+
+ /*
+ * If we have a command line, put it in an environment variable.
+ */
+ if (kernel_cmdline[0] != '\0') {
+ /* set string pointer */
+ (void) copyout((char *)&string_pos,
+ arg_pos,
+ sizeof (char *));
+ arg_pos += sizeof(char *);
+
+ /* copy string */
+ arg_ptr = (char *) cmdline_var;
+ arg_item_len = sizeof cmdline_var - 1;
+ (void) copyout(arg_ptr, string_pos, arg_item_len);
+ string_pos += arg_item_len;
+
+ /* copy string */
+ arg_ptr = kernel_cmdline;
+ arg_item_len = strlen(kernel_cmdline) + 1;
+ (void) copyout(arg_ptr, string_pos, arg_item_len);
+ string_pos += arg_item_len;
+ }
+ /*
+ * Null terminator for envp.
+ */
(void) copyout((char *)&zero, arg_pos, sizeof(char *));
}
@@ -483,4 +513,3 @@ static void user_bootstrap()
thread_bootstrap_return();
/*NOTREACHED*/
}
-