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Merged
IanSeyler merged 2 commits into from
May 12, 2026
+4 −8
Merged

Qa #107

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8f3dd94
jmp optimizations
IanSeyler May 12, 2026
2c82c26
Doc update
IanSeyler May 12, 2026
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2 changes: 1 addition & 1 deletion docs/README.md
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Expand Up @@ -216,7 +216,7 @@ The Pure64 information table is located at `0x0000000000005000` and ends at `0x0
<tr><td>0x50E1</td><td>8-bit</td><td>FLAG_X2APIC</td><td>1 if X2APIC is supported</td></tr>
<tr><td>0x50E2</td><td>8-bit</td><td>FLAG_BOOTMODE</td><td>'B' if BIOS, 'U' for UEFI</td></tr>
<tr><td>0x50E3 - 0x50FF</td><td>&nbsp;</td><td>&nbsp;</td><td>For future use</td></tr>
<tr><td>0x5100 - 0x51FF</td><td>8-bit</td><td>APIC_ID</td><td>APIC ID's for valid CPU cores (based on CORES_ACTIVE)</td></tr>
<tr><td>0x5100 - 0x51FF</td><td>32-bit</td><td>APIC_ID</td><td>APIC ID's for valid CPU cores (based on CORES_ACTIVE)</td></tr>
<tr><td>0x5200 - 0x53FF</td><td>&nbsp;</td><td>&nbsp;</td><td>For future use</td></tr>
<tr><td>0x5400 - 0x55FF</td><td>16 byte entries</td><td>PCIE</td><td>PCIe bus data</td></tr>
<tr><td>0x5600 - 0x56FF</td><td>16 byte entries</td><td>IOAPIC</td><td>I/O APIC addresses (based on IOAPIC_COUNT)</td></tr>
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8 changes: 2 additions & 6 deletions src/pure64.asm
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Expand Up @@ -712,8 +712,7 @@ create_pdpe_high:
stosq
add rax, 0x00001000 ; 4K later (512 records x 8 bytes)
dec ecx
cmp ecx, 0
jne create_pdpe_high
jnz create_pdpe_high

; Create the High Page-Directory Entries (PDE).
; A single PDE can map 2MiB of RAM
Expand All @@ -737,11 +736,8 @@ skipfirst4mb:
pde_high: ; Create a 2MiB page
stosq
add rax, 0x00200000 ; Increment by 2MiB
cmp ecx, 0
je pde_next_range
dec ecx
cmp ecx, 0
jne pde_high
jnz pde_high
jmp pde_next_range
pde_end:

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2 changes: 1 addition & 1 deletion src/sysvar.asm
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Expand Up @@ -39,7 +39,7 @@ VBEModeInfoBlock: equ 0x0000000000005F00 ; 256 bytes
; DQ - Starting at offset 0, increments by 0x8
p_ACPITableAddress: equ SystemVariables + 0x00
p_HPET_CyclesPerUs: equ SystemVariables + 0x08 ; Precomputed HPET cycles per microsecond
p_LocalAPICAddress: equ SystemVariables + 0x10
p_LocalAPICAddress: equ SystemVariables + 0x10 ; Address of the Local APIC (xAPIC)
p_HPET_Address: equ SystemVariables + 0x28
sys_timer: equ SystemVariables + 0x30
p_EBDA: equ SystemVariables + 0x38
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