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sparc32: drop sun4c bits from head_32.S

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As we no longer support sun4c we can remove all the code to
support remapping the kernel in head_32.S.
We also try to tell the user that the machine is not support,
in case someone try to boot the kernel on a sun4c one day

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sam Ravnborg 2012-05-11 11:35:15 +00:00 committed by David S. Miller
parent 3c23a7665b
commit 323206a1d5
1 changed files with 19 additions and 129 deletions
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148
arch/sparc/kernel/head_32.S
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@ -63,8 +63,8 @@ cputypvar_sun4m:
.align 4
sun4_notsup:
.asciz "Sparc-Linux sun4 support does no longer exist.\n\n"
sun4c_notsup:
.asciz "Sparc-Linux sun4/sun4c support does no longer exist.\n\n"
.align 4
sun4e_notsup:
@ -520,10 +520,10 @@ copy_prom_lvl14:
ldd [%g2 + 0x8], %g4
std %g4, [%g3 + 0x8] ! Copy proms handler
/* Must determine whether we are on a sun4c MMU, SRMMU, or SUN4/400 MUTANT
* MMU so we can remap ourselves properly. DON'T TOUCH %l0 thru %l5 in these
* remapping routines, we need their values afterwards!
/* DON'T TOUCH %l0 thru %l5 in these remapping routines,
* we need their values afterwards!
*/
/* Now check whether we are already mapped, if we
* are we can skip all this garbage coming up.
*/
@ -532,26 +532,6 @@ copy_prom_done:
be go_to_highmem ! this will be a nop then
nop
set LOAD_ADDR, %g6
cmp %g7, %g6
bne remap_not_a_sun4 ! This is not a Sun4
nop
or %g0, 0x1, %g1
lduba [%g1] ASI_CONTROL, %g1 ! Only safe to try on Sun4.
subcc %g1, 0x24, %g0 ! Is this a mutant Sun4/400???
be sun4_mutant_remap ! Ugh, it is...
nop
b sun4_normal_remap ! regular sun4, 2 level mmu
nop
remap_not_a_sun4:
lda [%g0] ASI_M_MMUREGS, %g1 ! same as ASI_PTE on sun4c
and %g1, 0x1, %g1 ! Test SRMMU Enable bit ;-)
cmp %g1, 0x0
be sun4c_remap ! A sun4c MMU or normal Sun4
nop
srmmu_remap:
/* First, check for a viking (TI) module. */
set 0x40000000, %g2
@ -657,72 +637,6 @@ srmmu_nviking:
b go_to_highmem
nop ! wheee....
/* This remaps the kernel on Sun4/4xx machines
* that have the Sun Mutant Three Level MMU.
* It's like a platypus, Sun didn't have the
* SRMMU in conception so they kludged the three
* level logic in the regular Sun4 MMU probably.
*
* Basically, you take each entry in the top level
* directory that maps the low 3MB starting at
* address zero and put the mapping in the KERNBASE
* slots. These top level pgd's are called regmaps.
*/
sun4_mutant_remap:
or %g0, %g0, %g3 ! source base
sethi %hi(KERNBASE), %g4 ! destination base
or %g4, %lo(KERNBASE), %g4
sethi %hi(0x300000), %g5
or %g5, %lo(0x300000), %g5 ! upper bound 3MB
or %g0, 0x1, %l6
sll %l6, 24, %l6 ! Regmap mapping size
add %g3, 0x2, %g3 ! Base magic
add %g4, 0x2, %g4 ! Base magic
/* Main remapping loop on Sun4-Mutant-MMU.
* "I am not an animal..." -Famous Mutant Person
*/
sun4_mutant_loop:
lduha [%g3] ASI_REGMAP, %g2 ! Get lower entry
stha %g2, [%g4] ASI_REGMAP ! Store in high entry
add %g4, %l6, %g4 ! Move up high memory ptr
subcc %g3, %g5, %g0 ! Reached our limit?
blu sun4_mutant_loop ! Nope, loop again
add %g3, %l6, %g3 ! delay, Move up low ptr
b go_to_highmem ! Jump to high memory.
nop
/* The following is for non-4/4xx sun4 MMU's. */
sun4_normal_remap:
mov 0, %g3 ! source base
set KERNBASE, %g4 ! destination base
set 0x300000, %g5 ! upper bound 3MB
mov 1, %l6
sll %l6, 18, %l6 ! sun4 mmu segmap size
sun4_normal_loop:
lduha [%g3] ASI_SEGMAP, %g6 ! load phys_seg
stha %g6, [%g4] ASI_SEGMAP ! stort new virt mapping
add %g3, %l6, %g3 ! increment source pointer
subcc %g3, %g5, %g0 ! reached limit?
blu sun4_normal_loop ! nope, loop again
add %g4, %l6, %g4 ! delay, increment dest ptr
b go_to_highmem
nop
/* The following works for Sun4c MMU's */
sun4c_remap:
mov 0, %g3 ! source base
set KERNBASE, %g4 ! destination base
set 0x300000, %g5 ! upper bound 3MB
mov 1, %l6
sll %l6, 18, %l6 ! sun4c mmu segmap size
sun4c_remap_loop:
lda [%g3] ASI_SEGMAP, %g6 ! load phys_seg
sta %g6, [%g4] ASI_SEGMAP ! store new virt mapping
add %g3, %l6, %g3 ! Increment source ptr
subcc %g3, %g5, %g0 ! Reached limit?
bl sun4c_remap_loop ! Nope, loop again
add %g4, %l6, %g4 ! delay, Increment dest ptr
/* Now do a non-relative jump so that PC is in high-memory */
go_to_highmem:
@ -759,16 +673,6 @@ execute_in_high_mem:
be found_version
nop
/* Old sun4's pass our load address into %o0 instead of the prom
* pointer. On sun4's you have to hard code the romvec pointer into
* your code. Sun probably still does that because they don't even
* trust their own "OpenBoot" specifications.
*/
set LOAD_ADDR, %g6
cmp %o0, %g6 ! an old sun4?
be sun4_init
nop
found_version:
/* Get the machine type via the mysterious romvec node operations. */
@ -823,16 +727,16 @@ got_prop:
/* Update boot_cpu_id only on boot cpu */
stub %g1, [%g2 + %lo(boot_cpu_id)]
ba sun4c_continue_boot
ba continue_boot
nop
#endif
set cputypval, %o2
ldub [%o2 + 0x4], %l1
cmp %l1, ' '
be 1f
be no_sun4c_here
cmp %l1, 'c'
be 1f
be no_sun4c_here
cmp %l1, 'm'
be 1f
cmp %l1, 's'
@ -847,19 +751,12 @@ got_prop:
1: set cputypval, %l1
ldub [%l1 + 0x4], %l1
cmp %l1, 'm' ! Test for sun4d, sun4e ?
be sun4m_init
cmp %l1, 's' ! Treat sun4s as sun4m
be sun4m_init
cmp %l1, 'd' ! Let us see how the beast will die
cmp %l1, 'd' ! Let us see how the beast will die
be sun4d_init
nop
/* Jump into mmu context zero. */
set AC_CONTEXT, %g1
stba %g0, [%g1] ASI_CONTROL
b sun4c_continue_boot
/* If not sun4d assume sun4m */
b sun4m_init
nop
/* CPUID in bootbus can be found at PA 0xff0140000 */
@ -959,7 +856,7 @@ sun4m_init:
srl %o1, 28, %o1 ! Get a type of the CPU
subcc %o1, 4, %g0 ! TI: Viking or MicroSPARC
be sun4c_continue_boot
be continue_boot
nop
set AC_M_SFSR, %o0
@ -969,7 +866,7 @@ sun4m_init:
/* Fujitsu MicroSPARC-II has no asynchronous flavors of FARs */
subcc %o1, 0, %g0
be sun4c_continue_boot
be continue_boot
nop
set AC_M_AFSR, %o0
@ -979,8 +876,7 @@ sun4m_init:
nop
sun4c_continue_boot:
continue_boot:
/* Aieee, now set PC and nPC, enable traps, give ourselves a stack and it's
* show-time!
@ -1161,18 +1057,12 @@ sun4c_continue_boot:
/* We should not get here. */
call halt_me
nop
sun4_init:
sethi %hi(SUN4_PROM_VECTOR+0x84), %o1
ld [%o1 + %lo(SUN4_PROM_VECTOR+0x84)], %o1
set sun4_notsup, %o0
call %o1 /* printf */
no_sun4c_here:
ld [%g7 + 0x68], %o1
set sun4c_notsup, %o0
call %o1
nop
sethi %hi(SUN4_PROM_VECTOR+0xc4), %o1
ld [%o1 + %lo(SUN4_PROM_VECTOR+0xc4)], %o1
call %o1 /* exittomon */
nop
1: ba 1b ! Cannot exit into KMON
b halt_me
nop
no_sun4e_here: