problem of SWITCH TO USER MODE solved :-)

[Adek336]

try inspecting the value you're feeding LGDT with !

[micro]

try inspecting the value you're feeding LGDT with !

i just copy someone's code (i am sorry ,forget who he is )
but i change the function which load the gdtr.. ,
any suggestion is expected.... thank you all !!

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struct gdt_ptr_struct
{
	u16int limit;
	u32int base;
} __attribute__((packed));

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typedef struct gdt_ptr_struct gdt_ptr_t;

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gdt_ptr_t	gdt_ptr;

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#define load_gdtr(n)\
__asm__("lgdt (%%eax)\n\t"\
::"a" (n));

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load_gdtr((u32int)&gdt_ptr);

[Adek336]

so how did you eventually make it work?

[codemastersnake]

I think this topic is worth to be added to WIKI

[Adek336]

but we don't know what was the problem (or I misunderstand the post flow)

[micro]

so how did you eventually make it work?

in fact , the code i had been posted work well,
maybe the problem comes from boot code which i used, . i think. maybe
i modified the boot code, and the GDT code worked