From 1f71b9576db536af84155363e14fc49e92de2eef Mon Sep 17 00:00:00 2001
From: Brett Weiland <brett_weiland@bpcspace.com>
Date: Sun, 29 Aug 2021 02:52:48 -0500
Subject: backup 8.29.21

---
 src/kernel/smp_trampoline.asm | 76 ++++++++++++++++++++++++++-----------------
 1 file changed, 47 insertions(+), 29 deletions(-)

(limited to 'src/kernel/smp_trampoline.asm')

diff --git a/src/kernel/smp_trampoline.asm b/src/kernel/smp_trampoline.asm
index 15b85e2..78303a3 100644
--- a/src/kernel/smp_trampoline.asm
+++ b/src/kernel/smp_trampoline.asm
@@ -1,13 +1,19 @@
 global smp_bootstrap_stackarray
 global smp_bootstrap_bsp
 global smp_bootstrap_corecount
+global final_gdt_descriptor
 
-extern multicore_main
+extern smp_kinit
+extern _pmem_vaddr
 
 [bits 16]
 smp_trampoline:
 cli
 
+in al, 0x92
+or al, 2
+out 0x92, al
+
 xor ax, ax
 mov ds, ax
 lgdt [.gdt_descriptor_p]
@@ -15,12 +21,11 @@ mov eax, cr0
 or eax, 0x1
 mov cr0, eax ; now in long mode
 
-jmp 0x8:.smp_protected
+jmp 0x8:smp_protected
 
 
 ;________________________________________________________________________________________
 
-;TODO find how to use old gdt
 .gdt_start_p: ; we need to start with a null gdt
 dd 0
 dd 0
@@ -52,9 +57,9 @@ SMP_PROTECTED_DATA_SEGMENT equ .gdt_data_p - .gdt_start_p
 
 ;________________________________________________________________________________________
 
-.smp_protected:
+smp_protected:
 
-[bits 32]
+bits 32
 mov ax, SMP_PROTECTED_DATA_SEGMENT
 mov ds, ax
 mov ss, ax
@@ -62,10 +67,8 @@ mov es, ax
 mov fs, ax
 mov gs, ax
 
-lgdt [.gdt_descriptor_l]
-
 
-mov eax, 0x10000 ;TODO clarify _why_ this is a thing
+mov eax, 0x10000
 mov cr3, eax
 
 ;setting up misc features
@@ -78,13 +81,15 @@ mov cr4, eax
 ;set NX and LME
 mov eax, 0x80000001
 cpuid
-and edx, 1 << 20
-shr edx, 9
+mov ebx, edx
+and ebx, 1 << 20
+shr ebx, 9
   
 mov ecx, 0xc0000080
 rdmsr
-or eax, 1 << 8 | 1 << 11
-or eax, edx
+or eax, 1 << 8 
+fuckyou:
+or eax, ebx
 wrmsr
 
 
@@ -94,14 +99,16 @@ or eax, 1 << 31 | 1 << 0;
 and ax, ~(1 << 2)
 mov cr0, eax
 
+lgdt [final_gdt_descriptor]
+
 
-jmp SMP_LONG_CODE_SEGMENT:.counter
+jmp SMP_LONG_CODE_SEGMENT:smp_longsetup
 
 ;________________________________________________________________________________________
 
-[bits 64]
-;TODO do we really need all this?
-.gdt_start_l:
+bits 64
+final_gdt:
+.start:
 ;and now we set up a temporary GDT creating a 1:1 mapping
 dw 0xffff
 dw 0
@@ -111,7 +118,7 @@ db 1
 db 0
 
 ;now for the code GDT:
-.gdt_code_l:
+.code:
 dw 0 ; segment limit 15:00 (I don't think this matters in 64 bit mode!)
 dw 0 ; base address 15:00
 db 0 ; base address 23:16
@@ -119,7 +126,7 @@ db 10011010b
 db 00100000b 
 db 0
 
-.gdt_data_l:
+.data:
 dw 0 
 dw 0 
 db 0 
@@ -127,17 +134,18 @@ db 10010010b
 db 00100000b  
 db 0
 
-.gdt_end_l: ; later calculates offset in defs below
+.end: ; later calculates offset in defs below
 
 
-.gdt_descriptor_l: 
-  dw .gdt_end_l - .gdt_start_l - 1 
-dq .gdt_start_l
+final_gdt_descriptor: 
+  dw final_gdt.end - final_gdt.start - 1 
+.offset:
+dq final_gdt.start
 
-SMP_LONG_CODE_SEGMENT equ .gdt_code_l - .gdt_start_l
-SMP_LONG_DATA_SEGMENT equ .gdt_data_l - .gdt_start_l
+SMP_LONG_CODE_SEGMENT equ final_gdt.code - final_gdt.start
+SMP_LONG_DATA_SEGMENT equ final_gdt.data - final_gdt.start
 
-.counter:
+smp_longsetup:
 mov eax, 1
 cpuid
 shr ebx, 24
@@ -146,19 +154,29 @@ jl .apic_below_bsp
 sub bl, 1
 
 .apic_below_bsp:
-
 mov rax, QWORD [smp_bootstrap_stackarray]
-debug:
 mov rsp, QWORD [rax + rbx * 8]
 
+mov rax, 0xffff800000000000
+;or QWORD [final_gdt_descriptor.offset], rax
+;lgdt [final_gdt_descriptor]
+
+.inc_corecounter:
+
+
 mov rax, [smp_bootstrap_corecount]
-inc BYTE [rax]
+lock inc BYTE [rax]
+
 
-mov rax, multicore_main
+
+smp_enter_kernel:
+mov rax, smp_kinit
 jmp rax
 
 align 8 
 smp_bootstrap_stackarray: dq 0
+smp_lock: dq 0
 smp_bootstrap_bsp: db 0
 smp_bootstrap_corecount: db 0
+
 times 512 - ($ - $$) db 0
-- 
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