Re: [Minios-devel] [PATCH 17/22] mini-os: add get_cmdline() function

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

Juergen Gross, on Tue 23 Aug 2016 17:16:03 +0200, wrote:
> The command line parameters are passed in start_info structure for pv,
> but via hvm_start_info for HVMlite. Add a generic function to fill a
> local cmdline variable with the command line string.
> 
> Signed-off-by: Juergen Gross <jgross@suse.com>

Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

> ---
>  arch/x86/setup.c | 20 ++++++++++++++++++--
>  include/kernel.h |  3 +++
>  kernel.c         |  1 +
>  main.c           |  5 +++--
>  4 files changed, 25 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/setup.c b/arch/x86/setup.c
> index 6645784..13633f0 100644
> --- a/arch/x86/setup.c
> +++ b/arch/x86/setup.c
> @@ -31,6 +31,7 @@
>  #include <mini-os/kernel.h>
>  #include <xen/xen.h>
>  #include <xen/arch-x86/cpuid.h>
> +#include <xen/arch-x86/hvm/start_info.h>
>  
>  /*
>   * Shared page for communicating with the hypervisor.
> @@ -88,6 +89,13 @@ static inline void sse_init(void) {
>  
>  #ifdef CONFIG_PARAVIRT
>  #define hpc_init()
> +
> +static void get_cmdline(void *p)
> +{
> +    start_info_t *si = p;
> +
> +    strncpy(cmdline, (char *)si->cmd_line, MAX_CMDLINE_SIZE - 1);
> +}
>  #else
>  static void hpc_init(void)
>  {
> @@ -109,6 +117,14 @@ static void hpc_init(void)
>      wrmsrl(ebx, (unsigned long)&hypercall_page);
>      barrier();
>  }
> +
> +static void get_cmdline(void *p)
> +{
> +    struct hvm_start_info *si = p;
> +
> +    if ( si->cmdline_paddr )
> +        strncpy(cmdline, to_virt(si->cmdline_paddr), MAX_CMDLINE_SIZE - 1);
> +}
>  #endif
>  
>  /*
> @@ -139,6 +155,7 @@ arch_init(void *par)
>  	   shared_info. Use xprintk instead. */
>  	get_console(par);
>  	get_xenbus(par);
> +	get_cmdline(par);
>  	si = par;
>  	memcpy(&start_info, si, sizeof(*si));
>  
> @@ -153,8 +170,7 @@ arch_init(void *par)
>  	printk("   mod_start: 0x%lx(VA)\n", si->mod_start);
>  	printk("     mod_len: %lu\n", si->mod_len);
>  	printk("       flags: 0x%x\n", (unsigned int)si->flags);
> -	printk("    cmd_line: %s\n",
> -			si->cmd_line ? (const char *)si->cmd_line : "NULL");
> +	printk("    cmd_line: %s\n", cmdline);
>  	printk("       stack: %p-%p\n", stack, stack + sizeof(stack));
>  
>  	/* Grab the shared_info pointer and put it in a safe place. */
> diff --git a/include/kernel.h b/include/kernel.h
> index 13e3274..d37ddda 100644
> --- a/include/kernel.h
> +++ b/include/kernel.h
> @@ -1,6 +1,9 @@
>  #ifndef _KERNEL_H_
>  #define _KERNEL_H_
>  
> +#define MAX_CMDLINE_SIZE 1024
> +extern char cmdline[MAX_CMDLINE_SIZE];
> +
>  void start_kernel(void);
>  void do_exit(void) __attribute__((noreturn));
>  void arch_do_exit(void);
> diff --git a/kernel.c b/kernel.c
> index 437e5b4..f22997e 100644
> --- a/kernel.c
> +++ b/kernel.c
> @@ -48,6 +48,7 @@
>  #include <xen/version.h>
>  
>  uint8_t xen_features[XENFEAT_NR_SUBMAPS * 32];
> +char cmdline[MAX_CMDLINE_SIZE];
>  
>  void setup_xen_features(void)
>  {
> diff --git a/main.c b/main.c
> index 4ec40b5..71e3be3 100644
> --- a/main.c
> +++ b/main.c
> @@ -6,6 +6,7 @@
>  
>  #ifdef HAVE_LIBC
>  #include <os.h>
> +#include <kernel.h>
>  #include <sched.h>
>  #include <console.h>
>  #include <netfront.h>
> @@ -134,7 +135,7 @@ static void call_main(void *p)
>  #define PARSE_ARGS_COUNT(ARGS) PARSE_ARGS(ARGS, argc++, c++, )
>  #define PARSE_ARGS_STORE(ARGS) PARSE_ARGS(ARGS, argv[argc++] = c, memmove(c, c + 1, strlen(c + 1) + 1), *c++ = 0)
>  
> -    PARSE_ARGS_COUNT((char*)start_info.cmd_line);
> +    PARSE_ARGS_COUNT(cmdline);
>  #ifdef CONFIG_QEMU_XS_ARGS
>      PARSE_ARGS_COUNT(domargs);
>  #endif
> @@ -143,7 +144,7 @@ static void call_main(void *p)
>      argv[0] = "main";
>      argc = 1;
>  
> -    PARSE_ARGS_STORE((char*)start_info.cmd_line)
> +    PARSE_ARGS_STORE(cmdline)
>  #ifdef CONFIG_QEMU_XS_ARGS
>      PARSE_ARGS_STORE(domargs)
>  #endif
> -- 
> 2.6.6
> 
> 
> _______________________________________________
> Minios-devel mailing list
> Minios-devel@lists.xenproject.org
> https://lists.xenproject.org/cgi-bin/mailman/listinfo/minios-devel

-- 
Samuel
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